IP source routing must be disabled.

From Perimeter L3 Switch Security Technical Implementation Guide

Part of IP Source Routing is not disabled on all routers.

Associated with IA controls: ECSC-1

SV-3081r3_rule IP source routing must be disabled.

Vulnerability discussion

Source routing is a feature of IP, whereby individual packets can specify routes. This feature is used in several different network attacks by bypassing perimeter and internal defense mechanisms.

Check content

Review the configuration to determine if source routing is disabled. If IP source routing is enabled, this is a finding.

Fix text

Configure the router to disable IP source routing.

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