The system must ignore IPv4 ICMP redirect messages.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

SV-38801r1_rule The system must ignore IPv4 ICMP redirect messages.

Vulnerability discussion

ICMP redirect messages are used by routers to inform hosts a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

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Fix text

Configure the system to ignore IPv4 ICMP redirect messages. #/usr/sbin/no -p -o ipignoreredirects=1

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