IDSS and IPSS.
Intrusion Detection Systems (IDSs)
Firewalls drop provable attack packets only;Intrusion detection systems (IDSs) look for suspicious traffic;Cannot drop because the packet is merely suspicious;Sends an alarm message if the attack appears to be serious;Problem: Too many false positives (false alarms);Alarms are ignored or the system is discontinued;Can reduce false positives by tuning the IDSs;Eliminate inapplicable rules, such as a Unix rule in an all-Windows company;Reduce the number of rules allowed to generate alarms;Most alarms will still be false alarms;Problem: Heavy processing requirements because of sophisticated filtering.Deep packet inspection;Looks at application content and transport and internet headers;Packet stream analysis;Looks at patterns across a series of packets;Often, patterns cannot be seen unless many packets are examined.
Intrusion Prevention Systems (IPSs)
Use IDS filtering mechanisms;Application-specific integrated circuits (ASICs) provide the needed processing ;power,Attack confidence identification spectrum.Somewhat likely,Very likely,Provable
Allowed to stop traffic at the high end of the attack confidence spectrum.Firm decides which attacks to stop
A firewall passes all packets that are not provable attack packets. This means that it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. Consequently, it is important to harden hosts to protect them against attack packets that the firewall does not drop.
Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Today, they also do egress filtering to prevent outgoing attacks by infected computers, responses to probe attacks, and the theft of intellectual property.
With the development of network technology and society, more and more network attacks, information security has become the focus of global attention. In order to deal with different kinds of network attacks, there are different network security devices and technical means, and firewall is one of the important network security devices. A firewall is a mechanism for checking every packet that passes through it. The firewall has a pass/reject mechanism that determines whether it should let packets pass the target. If the packet is a provable attack packet, the firewall discards it. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. Provable attack packets will be blocked and denied passage through the firewall and vice versa. The key point I took away from this chapter is the SPI firewall, which stands for State Pocket Inspection. SPI full-state packet detection firewall means that each connection information contains socket pairs: source address, destination address, source port, and destination port. For example, determine whether the firewall filters packets, such as the protocol type, TCP connection status, and timeout period. In addition to completing the packet filtering work of the simple packet filtering firewall, it also maintains a table in its own memory to track the connection status, which has higher security than the simple packet filtering firewall.
A firewall passes all packets that are not provable attack packets. So it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. Firewall technology is useless without strong management. Firms must define policies for firewalls very carefully, and these policies must drive both configuration and vulnerability testing to ensure that the firewall is operating properly.
The firewall checks every packet that passes through it. If the packet is a provable attack packet, the firewall will discard the packet. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. The firewall will deliver all unproven attack packets. This means that it will pass any real attack packet that is not a provable attack packet. In ingress filtering, the firewall examines packets entering the network from the out side, typically from the Internet. The purpose of ingress filtering is to stop attack packets from entering the firm’s internal network. Ingress filtering is what most people think of when they hear the term firewall filtering. In egress filtering, the firewall filters packets when they are leaving the network. This prevents replies to probe packets from leaving the network. It also prevents a firm’s infected hosts from attacking other firms. Egress filtering may even prevent employees and compromised hosts from sending files containing the firm’s intellectual property out of the firm
The topic of chapter 6 is about firewalls,including stateful packet inspection filtering, static packet filtering, network address translation, application proxy filtering, intrusion prevention system filtering and antivirus filtering. One point i learned from the chapter is that the firewalls can help companies a lot in condition plan、configure and manage them correctly, to some extent like ways of access control. For instance, An application proxy firewalls must be in the demilitarized zone (DMZ) because all of the servers are accessible to the outside world.Also companies must make firewalls policies very carefully, including configuration and vulnerability testing. They had better update firewall policies and ACLs regularly, and they need to allocate security professionals read the firewall log files frequently. If companies want to reduce management costs, they can use central firewall management systems, which actively manage firewalls from a single computer. The last but not least firewalls can not provide total protection and solve all security problems, there are two difficult problems in the future, the death of the perimeter and the long used signature detection in firewalls. VPNS may solve problems one and the anomaly detection is imprecise, but mandatory.
One key point taken from chapter 6 of the textbook is IPS and IDS. The new filtering method, intrusion prevention system (IPS), is capable of detecting and stopping attacks that are more sophisticated than earlier forms of filtering, including SPI, could address. Only time will tell if IPS filtering is capable of becoming a dominant filtering method for border firewalls. Intrusion prevention system filtering grew out of an earlier technology—intrusion detection systems (IDS). There are two serious limitations of IDSs. These have specific controls. IDSs tend to generate far too many false alarms, which, in IDS-speak, are false positives. Another problem is that IDS methodologies are highly processing-intensive. This limits the traffic volume that IDSs can filter. Although intrusion prevention systems (IPSs) use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do.
Firewalls stand like guards at the electronic gates to site networks. One key point taken from chapter 6 of the textbook is IPS and IDS.
And Firewalls typically log dropped attack packets, and the security staff should look through these logs frequently.There are many firewall filtering mechanisms. The first firewalls used static packet inspection, which only looks at single packets in isolation. Static packet inspection is unable to stop many attacks, so it is now used only as a secondary filtering mechanism or on a screening router—if it is used at all.
IDSS & IPSS
Intrusion prevention system filtering grew out of an earlier technology intrusion detection systems. If an IDS detects an apparently serious attack, it may send an alarm message to the security administrator. (If the attack does not seem too serious, the IDS will merely log it.) FIREWALLS VERSUS IDSS Traditionally, there was a strong distinction between firewalls and IDSs. Firewalls stop provable attack packets. If a packet is not a provable attack packet, the firewall cannot drop it. IDSs, in turn, identify suspicious packets that may or may not be parts of attacks.
Firewalls stop provable attack packets. If a packet is not a provable attack packet, the firewall cannot drop it. IDSs, in turn, identify suspicious packets that may or may not be parts of attacks.
Intrusion prevention systems grew out of IDS processing. Although intrusion prevention systems (IPSs) use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do. This is why they are called intrusion prevention systems.
Although IPSs use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do.
This chapter does a good job of explaining the differences between static packet filtering, stateful packet inspection, network address translation, and application proxy firewalls, and where these different techniques can reside.
One major takeaway I had from this chapter was the difference between Intrusion Detection Systems (IDSs) and Intrusion Prevention Systems (IPSs).
IDS primarily provides an alerting system that alerts users or security administrators if suspicious traffic or attacks are detected. IPS can actually block some attacks, not just monitor and warn like IDS. IPS can do this by dropping packets or throttling traffic, but it’s not completely reliable. With IDS and IPS, we are able to detect attacks from source code and act as a security barrier, while helping intrusion prevention systems detect/prevent network security attacks.
Reading this chapter I think that Firewalls stand like guards at the electronic gates to site networks. Although they do not provide total protection, they remain one of the prime elements in any company’s security. Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Today, they also do egress filtering to prevent outgoing attacks by infected computers, responses to probe attacks, and the theft of intellectual property. Internal firewalls provide protection to sensitive servers from internal attacks, and host firewalls protect both clients and servers directly. Companies must carefully plan their firewall architectures (how they arrange their firewalls to provide maximum protection). Firewalls typically log dropped attack packets, and the security staff should look through these logs frequently.
This part mainly introduces firewall, including network address translation, application proxy firewall, Intrusion Detection System and Intrusion Prevention System, firewall management. Firewall is one of the important network security devices. A firewall is a mechanism that inspects every packet that passes through it. The firewall has a pass/reject mechanism to determine if it should let the packet through the target.
This chapter discusses firewall rules, packet filtering, inspection, and perimeter firewall architecture design for large organizational sites. A firewall is an access control device that looks at packet filtering, compares it with user-based policy rules, and decides whether to allow or deny packets. Firewall appliances are used for network security to verify packet filtering, stateful inspection, proxies, and Nat rules.
1. Intrusion Detection System (IDS)
Intrusion detection system, professionally speaking, is in accordance with a certain security strategy, the network, system running status monitoring, as far as possible to find all kinds of attack attempt, attack behavior or attack results, in order to ensure the confidentiality of network system resources, integrity and availability.
The position of IDS on a switched network is as close to the attack source as possible and as close to protected resources as possible.
These locations are typically: on switches in the server area; On the first switch after the Internet access router; On LAN switches in the key protection network segment.
2. Intrusion Prevention System (IPS)
With the continuous improvement of network attack technology and the discovery of network security loopholes, traditional firewall technology and traditional IDS technology can not cope with some security threats. The IPS technology can deeply detect and detect the data traffic that passes through the network, discard malicious packets to block attacks, and limit the traffic of abusive packets to protect network bandwidth resources.
From this chapter I know that there are many different types of firewalls. Before reading this chapter, I believe IDS and IPS were a different set of technologies, but at its core it’s just a firewall. It is important to understand the differences between these types of firewalls because it will be beneficial when developing a solution for a business to implement.
This chapter describes intrusion detection systems that monitor a network or system for any suspicious or malicious activity, and when it comes to such malicious activity, the goal of an IDS is to detect activity rather than prevent it. Some components of an intrusion detection system include protected systems, sensors, decision engines, database knowledge, and database configuration. Systems that are also involved in blocking malicious activity are called intrusion prevention systems. Once malicious behavior is analyzed, IPS has the ability to block malicious behavior.
Intrusion Detection System (IDS)
Firewall drops only provable attack packets; Intrusion Detection System (IDS) looks for suspicious traffic; cannot drop because packets are only suspicious; sends alert messages if attack appears to be serious
Problem: too many false positives; alerts are ignored or the system breaks; false positives can be reduced by tuning the IDS; eliminating inapplicable rules and reducing the number of rules allowed to generate alerts.
Problem: extensive processing required due to complex filtering. Deep packet inspection; look at application content and transport and Internet headers; packet flow analysis; look at patterns in a series of packets; usually, patterns cannot be seen unless many packets are inspected.
Intrusion Prevention System (IPS)
Uses IDS filtering mechanisms; Application Specific Integrated Circuits (ASICs) provide the required processing power, attack confidence identification spectrum.
The key point of this chapter is firewalls.
Firewalls do not provide total protection, they remain one of the prime elements in any company’s security. Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Firewalls do not work automatically. They require careful planning, implementation, and day to-day management. Without a great deal of initial and continuing management labor, firewalls look impressive physically but provide little protection.
Intrusion detection system (intrusion detection system, referred to as “IDS”) is a kind of network security device that monitors the network transmission immediately, issues the alarm or takes the initiative response measure when discovering the suspicious transmission. It is different from other network security devices in that IDS is an active security protection technology.
Intrusion prevention system (IPS) is a network security tool (which can be hardware or software) that can continuously monitor malicious activity in the network and take preventive actions such as reporting, blocking or discarding when an intrusion occurs.
I have some knowledge about Static Packet Filtering. It was the earliest firewall filtering mechanism, Static packet filtering looks at packets one at a time, in isolation, and only looks at some fields in the Internet and transport layer headers. However, static packet filtering can stop certain attacks very efficiently. Its market status is that it no longer used as the main filtering mechanism for border firewalls,may be used as a secondary filtering mechanism on main border firewalls,and it also may be implemented in border routers, which lie between the Internet and the firewall,stops simple , high-volume attacks to reduce the load on the main border fire-wall.
I have noticed that fierwall could not defend every attack. Note that a firewall passes all packets that are not provable attack packets. This means that it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. There are many types of firewall. Border firewall sits at the boundary between the corporate site and the external Internet. And firewall is updating too. We are likely to see the growth of unified threat management (UTM) firewalls, which handle traditional firewall processing, antivirus filtering, and even spam filtering. (As we will discuss later, traditional firewalls do not do antivirus filtering and other application-level malware filtering.) There are several filtering methods for examining packets. These methods include (1) stateful packet inspection filtering, (2) static packet filtering, (3) network address translation, (4) application proxy filtering, (5) intrusion prevention system filtering, and (6) antivirus filtering.
The firewall checks every packet that passes through it. If the packet is a provable attack packet, the firewall will discard the packet. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. The firewall will deliver all unproven attack packets. This means that it will pass any real attack packet that is not a provable attack packet. In ingress filtering, the firewall examines packets entering the network from the out side, typically from the Internet.
The purpose of ingress filtering is to stop attack packets from entering the firm’s internal network. Ingress filtering is what most people think of when they hear the term firewall filtering. In egress filtering, the firewall filters packets when they are leaving the network. This prevents replies to probe packets from leaving the network. It also prevents a firm’s infected hosts from attacking other firms. Egress filtering may even prevent employees and compromised hosts from sending files containing the firm’s intellectual property out of the firm
I learned a lot from this article, this article made me understand what is a firewall, a firewall is a device which can filter packets with no provable attacks, and this function is useful for an organization to protect its information can be stored in a safe network environment and to reduce the probility of the occurrence of data breach.
A firewall is a mechanism that checks every packet that passes through it. The firewall has a pass / reject mechanism to decide whether packets should pass through the target. If the packet is a provable attack packet, the firewall will discard it. If the packet is not a provable attack packet, the firewall sends the packet to its destination. Firewall is classified according to the scope of work and its characteristics. It is divided into filter firewall, application agent firewall and composite firewall.
1. Filtering firewall
The filtering firewall is in the network layer and transmission layer. It can analyze based on the address of the data source and the type of protocol to determine whether it can pass. Under the standard of firewall, information can be transmitted only when the security performance and type are met, and some unsafe factors will be filtered and blocked by the firewall.
2. Application proxy type firewall
The working scope of application proxy firewall is at the highest level of OIS, above the application layer. The network communication flow can be completely isolated, and the supervision and control of the application layer can be realized through a specific agent.
3. Composite firewall
Composite firewall is a widely used firewall. It integrates the advantages of packet filtering firewall technology and application proxy firewall technology, discards the original disadvantages of the two firewalls, and greatly improves the flexibility and security of firewall technology in application practice.
From a professional point of view, intrusion detection system monitors the operation status of the network and system according to a certain security strategy, and finds various attack attempts, attack behaviors or attack results as much as possible, so as to ensure the confidentiality, integrity and availability of network system resources.
The IDS is protected as close to the source as possible.
These locations are usually: on the switch in the server area; On the first switch after the Internet access router; The key protects the LAN switch in the network segment.
2. Intrusion prevention system (IPS)
With the continuous improvement of network attack technology and the discovery of network security vulnerabilities, the traditional firewall technology and traditional intrusion detection technology have been unable to deal with some security threats. IPS technology can deeply detect the data traffic through the network, discard malicious packets to prevent attacks, and limit the traffic of abusing packets to protect network bandwidth resources.
Firms have long used intrusion detection systems (IDSs), which provide deep packet inspection and examine streams of packets instead of just individual packets. The goal of an IDS is to look for suspicious packets and report them—but not stop them. New firewalls that use IDS methods to actually drop packets are called intrusion prevention systems (IPSs). IPSs use ASIC hardware to provide the speed needed to analyze traffic in real time (which is necessary to drop packets). In addition, IPSs only drop packets if they are highly certain that they are seeing an actual attack instead of just suspicious activities. If IPSs are less sure that a stream of packets is an attack, they may limit that traffic to a certain percent of total bandwidth in order to minimize damage.
Weiwei Zhao says
IDSS and IPSS.
Intrusion Detection Systems (IDSs)
Firewalls drop provable attack packets only;Intrusion detection systems (IDSs) look for suspicious traffic;Cannot drop because the packet is merely suspicious;Sends an alarm message if the attack appears to be serious;Problem: Too many false positives (false alarms);Alarms are ignored or the system is discontinued;Can reduce false positives by tuning the IDSs;Eliminate inapplicable rules, such as a Unix rule in an all-Windows company;Reduce the number of rules allowed to generate alarms;Most alarms will still be false alarms;Problem: Heavy processing requirements because of sophisticated filtering.Deep packet inspection;Looks at application content and transport and internet headers;Packet stream analysis;Looks at patterns across a series of packets;Often, patterns cannot be seen unless many packets are examined.
Intrusion Prevention Systems (IPSs)
Use IDS filtering mechanisms;Application-specific integrated circuits (ASICs) provide the needed processing ;power,Attack confidence identification spectrum.Somewhat likely,Very likely,Provable
Allowed to stop traffic at the high end of the attack confidence spectrum.Firm decides which attacks to stop
Chang Cui says
A firewall passes all packets that are not provable attack packets. This means that it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. Consequently, it is important to harden hosts to protect them against attack packets that the firewall does not drop.
Haoyu Bai says
Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Today, they also do egress filtering to prevent outgoing attacks by infected computers, responses to probe attacks, and the theft of intellectual property.
Xiaomeng Chen says
With the development of network technology and society, more and more network attacks, information security has become the focus of global attention. In order to deal with different kinds of network attacks, there are different network security devices and technical means, and firewall is one of the important network security devices. A firewall is a mechanism for checking every packet that passes through it. The firewall has a pass/reject mechanism that determines whether it should let packets pass the target. If the packet is a provable attack packet, the firewall discards it. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. Provable attack packets will be blocked and denied passage through the firewall and vice versa. The key point I took away from this chapter is the SPI firewall, which stands for State Pocket Inspection. SPI full-state packet detection firewall means that each connection information contains socket pairs: source address, destination address, source port, and destination port. For example, determine whether the firewall filters packets, such as the protocol type, TCP connection status, and timeout period. In addition to completing the packet filtering work of the simple packet filtering firewall, it also maintains a table in its own memory to track the connection status, which has higher security than the simple packet filtering firewall.
Zhiyuan Lian says
A firewall passes all packets that are not provable attack packets. So it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. Firewall technology is useless without strong management. Firms must define policies for firewalls very carefully, and these policies must drive both configuration and vulnerability testing to ensure that the firewall is operating properly.
Lisheng Lin says
The firewall checks every packet that passes through it. If the packet is a provable attack packet, the firewall will discard the packet. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. The firewall will deliver all unproven attack packets. This means that it will pass any real attack packet that is not a provable attack packet. In ingress filtering, the firewall examines packets entering the network from the out side, typically from the Internet. The purpose of ingress filtering is to stop attack packets from entering the firm’s internal network. Ingress filtering is what most people think of when they hear the term firewall filtering. In egress filtering, the firewall filters packets when they are leaving the network. This prevents replies to probe packets from leaving the network. It also prevents a firm’s infected hosts from attacking other firms. Egress filtering may even prevent employees and compromised hosts from sending files containing the firm’s intellectual property out of the firm
Yongheng Luo says
The topic of chapter 6 is about firewalls,including stateful packet inspection filtering, static packet filtering, network address translation, application proxy filtering, intrusion prevention system filtering and antivirus filtering. One point i learned from the chapter is that the firewalls can help companies a lot in condition plan、configure and manage them correctly, to some extent like ways of access control. For instance, An application proxy firewalls must be in the demilitarized zone (DMZ) because all of the servers are accessible to the outside world.Also companies must make firewalls policies very carefully, including configuration and vulnerability testing. They had better update firewall policies and ACLs regularly, and they need to allocate security professionals read the firewall log files frequently. If companies want to reduce management costs, they can use central firewall management systems, which actively manage firewalls from a single computer. The last but not least firewalls can not provide total protection and solve all security problems, there are two difficult problems in the future, the death of the perimeter and the long used signature detection in firewalls. VPNS may solve problems one and the anomaly detection is imprecise, but mandatory.
Tianyu Zhang says
One key point taken from chapter 6 of the textbook is IPS and IDS. The new filtering method, intrusion prevention system (IPS), is capable of detecting and stopping attacks that are more sophisticated than earlier forms of filtering, including SPI, could address. Only time will tell if IPS filtering is capable of becoming a dominant filtering method for border firewalls. Intrusion prevention system filtering grew out of an earlier technology—intrusion detection systems (IDS). There are two serious limitations of IDSs. These have specific controls. IDSs tend to generate far too many false alarms, which, in IDS-speak, are false positives. Another problem is that IDS methodologies are highly processing-intensive. This limits the traffic volume that IDSs can filter. Although intrusion prevention systems (IPSs) use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do.
Yiqiong Zhang says
Firewalls stand like guards at the electronic gates to site networks. One key point taken from chapter 6 of the textbook is IPS and IDS.
And Firewalls typically log dropped attack packets, and the security staff should look through these logs frequently.There are many firewall filtering mechanisms. The first firewalls used static packet inspection, which only looks at single packets in isolation. Static packet inspection is unable to stop many attacks, so it is now used only as a secondary filtering mechanism or on a screening router—if it is used at all.
Yuting Yang says
IDSS & IPSS
Intrusion prevention system filtering grew out of an earlier technology intrusion detection systems. If an IDS detects an apparently serious attack, it may send an alarm message to the security administrator. (If the attack does not seem too serious, the IDS will merely log it.) FIREWALLS VERSUS IDSS Traditionally, there was a strong distinction between firewalls and IDSs. Firewalls stop provable attack packets. If a packet is not a provable attack packet, the firewall cannot drop it. IDSs, in turn, identify suspicious packets that may or may not be parts of attacks.
Firewalls stop provable attack packets. If a packet is not a provable attack packet, the firewall cannot drop it. IDSs, in turn, identify suspicious packets that may or may not be parts of attacks.
Intrusion prevention systems grew out of IDS processing. Although intrusion prevention systems (IPSs) use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do. This is why they are called intrusion prevention systems.
Although IPSs use IDS filtering methods, they actually stop some kinds of attacks instead of merely identifying them and generating alarms, as IDSs do.
Zijie Yuan says
This chapter does a good job of explaining the differences between static packet filtering, stateful packet inspection, network address translation, and application proxy firewalls, and where these different techniques can reside.
Xuemeng Li says
One major takeaway I had from this chapter was the difference between Intrusion Detection Systems (IDSs) and Intrusion Prevention Systems (IPSs).
IDS primarily provides an alerting system that alerts users or security administrators if suspicious traffic or attacks are detected. IPS can actually block some attacks, not just monitor and warn like IDS. IPS can do this by dropping packets or throttling traffic, but it’s not completely reliable. With IDS and IPS, we are able to detect attacks from source code and act as a security barrier, while helping intrusion prevention systems detect/prevent network security attacks.
Yue Ma says
Reading this chapter I think that Firewalls stand like guards at the electronic gates to site networks. Although they do not provide total protection, they remain one of the prime elements in any company’s security. Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Today, they also do egress filtering to prevent outgoing attacks by infected computers, responses to probe attacks, and the theft of intellectual property. Internal firewalls provide protection to sensitive servers from internal attacks, and host firewalls protect both clients and servers directly. Companies must carefully plan their firewall architectures (how they arrange their firewalls to provide maximum protection). Firewalls typically log dropped attack packets, and the security staff should look through these logs frequently.
Shengyuan Yu says
This part mainly introduces firewall, including network address translation, application proxy firewall, Intrusion Detection System and Intrusion Prevention System, firewall management. Firewall is one of the important network security devices. A firewall is a mechanism that inspects every packet that passes through it. The firewall has a pass/reject mechanism to determine if it should let the packet through the target.
Yu Hu says
This chapter discusses firewall rules, packet filtering, inspection, and perimeter firewall architecture design for large organizational sites. A firewall is an access control device that looks at packet filtering, compares it with user-based policy rules, and decides whether to allow or deny packets. Firewall appliances are used for network security to verify packet filtering, stateful inspection, proxies, and Nat rules.
Shengjie Zhang says
1. Intrusion Detection System (IDS)
Intrusion detection system, professionally speaking, is in accordance with a certain security strategy, the network, system running status monitoring, as far as possible to find all kinds of attack attempt, attack behavior or attack results, in order to ensure the confidentiality of network system resources, integrity and availability.
The position of IDS on a switched network is as close to the attack source as possible and as close to protected resources as possible.
These locations are typically: on switches in the server area; On the first switch after the Internet access router; On LAN switches in the key protection network segment.
2. Intrusion Prevention System (IPS)
With the continuous improvement of network attack technology and the discovery of network security loopholes, traditional firewall technology and traditional IDS technology can not cope with some security threats. The IPS technology can deeply detect and detect the data traffic that passes through the network, discard malicious packets to block attacks, and limit the traffic of abusive packets to protect network bandwidth resources.
Xiaohan Chen says
From this chapter I know that there are many different types of firewalls. Before reading this chapter, I believe IDS and IPS were a different set of technologies, but at its core it’s just a firewall. It is important to understand the differences between these types of firewalls because it will be beneficial when developing a solution for a business to implement.
Lei Tian says
This chapter describes intrusion detection systems that monitor a network or system for any suspicious or malicious activity, and when it comes to such malicious activity, the goal of an IDS is to detect activity rather than prevent it. Some components of an intrusion detection system include protected systems, sensors, decision engines, database knowledge, and database configuration. Systems that are also involved in blocking malicious activity are called intrusion prevention systems. Once malicious behavior is analyzed, IPS has the ability to block malicious behavior.
Yalin Zou says
Intrusion Detection System (IDS)
Firewall drops only provable attack packets; Intrusion Detection System (IDS) looks for suspicious traffic; cannot drop because packets are only suspicious; sends alert messages if attack appears to be serious
Problem: too many false positives; alerts are ignored or the system breaks; false positives can be reduced by tuning the IDS; eliminating inapplicable rules and reducing the number of rules allowed to generate alerts.
Problem: extensive processing required due to complex filtering. Deep packet inspection; look at application content and transport and Internet headers; packet flow analysis; look at patterns in a series of packets; usually, patterns cannot be seen unless many packets are inspected.
Intrusion Prevention System (IPS)
Uses IDS filtering mechanisms; Application Specific Integrated Circuits (ASICs) provide the required processing power, attack confidence identification spectrum.
Yijing Zhan says
The key point of this chapter is firewalls.
Firewalls do not provide total protection, they remain one of the prime elements in any company’s security. Traditionally, firewalls provided ingress filtering to stop attack packets from getting into the firm. Firewalls do not work automatically. They require careful planning, implementation, and day to-day management. Without a great deal of initial and continuing management labor, firewalls look impressive physically but provide little protection.
Ziqiao Wang says
Intrusion detection system (intrusion detection system, referred to as “IDS”) is a kind of network security device that monitors the network transmission immediately, issues the alarm or takes the initiative response measure when discovering the suspicious transmission. It is different from other network security devices in that IDS is an active security protection technology.
Intrusion prevention system (IPS) is a network security tool (which can be hardware or software) that can continuously monitor malicious activity in the network and take preventive actions such as reporting, blocking or discarding when an intrusion occurs.
Yanxue Li says
I have some knowledge about Static Packet Filtering. It was the earliest firewall filtering mechanism, Static packet filtering looks at packets one at a time, in isolation, and only looks at some fields in the Internet and transport layer headers. However, static packet filtering can stop certain attacks very efficiently. Its market status is that it no longer used as the main filtering mechanism for border firewalls,may be used as a secondary filtering mechanism on main border firewalls,and it also may be implemented in border routers, which lie between the Internet and the firewall,stops simple , high-volume attacks to reduce the load on the main border fire-wall.
Xinyu Dai says
I have noticed that fierwall could not defend every attack. Note that a firewall passes all packets that are not provable attack packets. This means that it will pass any true attack packet that is not a provable attack packet. This will allow attack packets to get through to their targets. There are many types of firewall. Border firewall sits at the boundary between the corporate site and the external Internet. And firewall is updating too. We are likely to see the growth of unified threat management (UTM) firewalls, which handle traditional firewall processing, antivirus filtering, and even spam filtering. (As we will discuss later, traditional firewalls do not do antivirus filtering and other application-level malware filtering.) There are several filtering methods for examining packets. These methods include (1) stateful packet inspection filtering, (2) static packet filtering, (3) network address translation, (4) application proxy filtering, (5) intrusion prevention system filtering, and (6) antivirus filtering.
Yujia Hu says
The firewall checks every packet that passes through it. If the packet is a provable attack packet, the firewall will discard the packet. If the packet is not a provable attack packet, the firewall will deliver the packet to its destination. The firewall will deliver all unproven attack packets. This means that it will pass any real attack packet that is not a provable attack packet. In ingress filtering, the firewall examines packets entering the network from the out side, typically from the Internet.
The purpose of ingress filtering is to stop attack packets from entering the firm’s internal network. Ingress filtering is what most people think of when they hear the term firewall filtering. In egress filtering, the firewall filters packets when they are leaving the network. This prevents replies to probe packets from leaving the network. It also prevents a firm’s infected hosts from attacking other firms. Egress filtering may even prevent employees and compromised hosts from sending files containing the firm’s intellectual property out of the firm
Yutong Sun says
I learned a lot from this article, this article made me understand what is a firewall, a firewall is a device which can filter packets with no provable attacks, and this function is useful for an organization to protect its information can be stored in a safe network environment and to reduce the probility of the occurrence of data breach.
Hang Zhao says
A firewall is a mechanism that checks every packet that passes through it. The firewall has a pass / reject mechanism to decide whether packets should pass through the target. If the packet is a provable attack packet, the firewall will discard it. If the packet is not a provable attack packet, the firewall sends the packet to its destination. Firewall is classified according to the scope of work and its characteristics. It is divided into filter firewall, application agent firewall and composite firewall.
1. Filtering firewall
The filtering firewall is in the network layer and transmission layer. It can analyze based on the address of the data source and the type of protocol to determine whether it can pass. Under the standard of firewall, information can be transmitted only when the security performance and type are met, and some unsafe factors will be filtered and blocked by the firewall.
2. Application proxy type firewall
The working scope of application proxy firewall is at the highest level of OIS, above the application layer. The network communication flow can be completely isolated, and the supervision and control of the application layer can be realized through a specific agent.
3. Composite firewall
Composite firewall is a widely used firewall. It integrates the advantages of packet filtering firewall technology and application proxy firewall technology, discards the original disadvantages of the two firewalls, and greatly improves the flexibility and security of firewall technology in application practice.
Dacheng Xu says
1. Intrusion detection system (IDS)
From a professional point of view, intrusion detection system monitors the operation status of the network and system according to a certain security strategy, and finds various attack attempts, attack behaviors or attack results as much as possible, so as to ensure the confidentiality, integrity and availability of network system resources.
The IDS is protected as close to the source as possible.
These locations are usually: on the switch in the server area; On the first switch after the Internet access router; The key protects the LAN switch in the network segment.
2. Intrusion prevention system (IPS)
With the continuous improvement of network attack technology and the discovery of network security vulnerabilities, the traditional firewall technology and traditional intrusion detection technology have been unable to deal with some security threats. IPS technology can deeply detect the data traffic through the network, discard malicious packets to prevent attacks, and limit the traffic of abusing packets to protect network bandwidth resources.
Ying Cheng says
Firms have long used intrusion detection systems (IDSs), which provide deep packet inspection and examine streams of packets instead of just individual packets. The goal of an IDS is to look for suspicious packets and report them—but not stop them. New firewalls that use IDS methods to actually drop packets are called intrusion prevention systems (IPSs). IPSs use ASIC hardware to provide the speed needed to analyze traffic in real time (which is necessary to drop packets). In addition, IPSs only drop packets if they are highly certain that they are seeing an actual attack instead of just suspicious activities. If IPSs are less sure that a stream of packets is an attack, they may limit that traffic to a certain percent of total bandwidth in order to minimize damage.