we all know that the basic function of firewall is to protect specific networks from distrustful network attacks. but at the same time, legal communication between two networks must be allowed. The firewall security policy is the basic security control mechanism to check whether the data flow can pass through the firewall according to certain rules. In other words, the function of security policy is to test the data flow passing through the firewall, and the legitimate data flow conforming to the security policy can pass through the firewall. After knowing what is the firewall security policy, SPOTOwill  continue to explain it in detail.

The Functions of Firewall Security Policy

through firewall security policy, we can control the access rights of Intranet to Extranet, and control the access rights between sub-nets with different security levels of intranet. At the same time, it can also control the access of the device itself, such as limiting which IP addresses can log in to the device through Telnet and Web, and controlling the mutual access between the network management server, NTP server and the device. These are the functions of firewall security policy.

we all know that the basic function of firewall is to protect specific networks from distrustful network attacks, but at the same time, legal communication between two networks must be allowed. The firewall security policy is the basic security control mechanism to check whether the data flow can pass through the firewall according to certain rules. In other words, the function of security policy is to test the data flow passing through the firewall, and the legitimate data flow conforming to the security policy can pass through the firewall. After knowing what is the firewall security policy, SPOTOwill continue to explain it in detail.

The Functions of Firewall Security Policy

through firewell security policy, we can control the access rights of Intranet to Extranet, and control the access rights between sub-nets with different security levels of intranet. At the same time, it can also control the access of the device itself, such as limiting which IP addresses can log in to the device through Telnet and Web, and controlling the mutual access between the network management server, NTP server and the device. These are the functions of firewall security policy.

Packet Filtering of Firewell Security Policy

we mentioned a certain rule of firewell security policy above, and the essence of this rule is packet filtering. Packet filtering can define the data flow in the network through the combination of Source MAC Address, Destination MAC Address. Source IP Address, Destination IP Address. Source Port Number, Destination Port Number. Upper Layer Protocol and other information of the message. Among them, Source IP Address. Destination IP Address. Source Port Number. Destination Port Number and Upper Layer Protocol are the five groups often mentioned in the state detection firewell. The firewall controls the forwarding of traffic between security areas according to thepacket filtering rules of those five groups.

However the next generation of firewall security policy does not necessarily rely on packet filtering. and it can not only completely replace the function of packet filtering. but also further realize the traffic forwarding control based on users and applications. But also carry out security detection and processing of the content of traffic in the source  destination security area. time period. user application and other dimensions to control flow more finely.

How does the firewall security policy work?. First NGFW that is the next generation firewall will detect the received flow and detect the attributes of the flow including source security area destination security area. Source address  region destination address  region user. Service source port destination port protocol type application and time period etc.

If all conditions match, the traffic could successfully match the security policy. If one of the conditions does not match. It will continue to match the next security policy. By analogy. If all security policies do not match. NGFW will perform the action of the default security policy.

If the flow successfully matches a security policy. NGFW will execute the action of this security policy. If the action is prohibited. NGFW will block this flow. If the action is allowed. NGFW will judge whether the security policy references the security configuration file.

If the action of the security policy is allowed and the security configuration file is referenced. NGFW will conduct integrated content security detection on the flow. If the security configuration file is not referenced. this flowwill be allowed to pass through.Extended reading: https://www.spotodumps.com

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