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CLI-based Configuration Guide - Security

AR500, AR510, and AR530 V200R007

This document describes the configurations of Security, including AAA, DAA,NAC, BRAS Access, ACL, Firewall, Deep Security Defense, Local Attack Defense;Attack Defense, Traffic Suppression, ARP Security, Port Security, DHCP Snooping, IPSG, URPF, PKI, SSL, HTTPS, Keychain, separating the management plane from the service plane, security risks.
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What Is the Relationship Between the permit/deny Rules in an ACL and Those in the Behavior of a Traffic Policy?

What Is the Relationship Between the permit/deny Rules in an ACL and Those in the Behavior of a Traffic Policy?

An ACL is usually used with a traffic policy. A traffic policy includes the traffic classifier that meets the requirement of an ACL and a traffic behavior, such as permit/deny.

The permit/deny rules in an ACL and a behavior in the traffic policy are used as follows.
Table 4-21  Usage of permit/deny rules in an ACL and in a behavior

ACL

Behavior in a Traffic Policy

Action Taken for Matching Packets

permit

permit

permit

permit

deny

deny

deny

permit

deny

deny

deny

deny

NOTE:

The traffic policy module permits packets by default. If you just want to block mutual access between network segments, you only need to define the characteristics of the packets to be denied in the ACL. If you add rule permit at the bottom of the ACL, the packets that do not match previous rules will match the last rule. In addition, if the traffic behavior is set to deny, the device discards all packets matching rule permit. As a result, all services are interrupted.

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Updated: 2019-05-25

Document ID: EDOC1000097287

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