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CLI-based Configuration Guide - Security

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Services Are Interrupted Due to Incorrect IP Address Wildcard Mask

Services Are Interrupted Due to Incorrect IP Address Wildcard Mask

Fault Description

A traffic policy has been configured on a device to redirect packets. To redirect the packets from a certain IP address, the administrator adds a rule to the ACL used by the traffic policy following the ACL configuration principle. The new rule uses this source IP address as the matching condition. However, the IP address wildcard mask in the rule is incorrectly configured. As a result, BGP packets cannot be sent to the CPU and most services are interrupted.

Procedure

  1. Run the display this command in the ACL view to check the new rule.

    The new rule is as follows:

    rule 100 permit ip source 10.1.1.3 255.255.255.255

    The IP address wildcard mask is 255.255.255.255, which is not an inverse mask. This rule is equivalent to "rule 100 permit ip" and "rule 100 permit ip source any", meaning that packets from any IP address are matched.

    The traffic policy using this ACL has been applied to a large number of interfaces, so all BGP packets received by these interfaces are redirected to other interfaces, but not sent to the CPU. The device times out to process protocol packets and most services are interrupted.

  2. Run the rule (advanced ACL view) command in the ACL view to modify the IP address wildcard mask in the new rule.

    The modified rule is as follows:

    rule 100 permit ip source 10.1.1.3 0.0.0.0 //indicates the IP address of a single host only when the IP address wildcard mask is 0.0.0.0.

    Services are recovered, and packets from source IP address 10.1.1.3 are redirected correctly.

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Updated: 2019-05-20

Document ID: EDOC1100034236

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