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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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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 filter packets. To filter the packets from a certain IP address, the administrator adds a rule to the ACL used by the traffic policy following the ACL configuration guidelines. 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, all IP packets are discarded and 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/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 IP packets received by these interfaces are discarded. 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 discarded.

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Updated: 2019-04-01

Document ID: EDOC1000178319

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