The system must not have 6to4 enabled.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-38926r1_rule The system must not have 6to4 enabled.

Vulnerability discussion

6to4 is an IPv6 transition mechanism involving tunneling IPv6 packets encapsulated in IPv4 packets on an ad-hoc basis. This is not a preferred transition strategy and increases the attack surface of the system.

Check content

Determine if there are any 6to4 tunnels configured on the system. #ifconfig -a If there are any sit or cit adapters in the ifconfig listing, this is a finding.

Fix text

Remove the configuration for any 6to4 tunnels on the system. #ifconfig sit0 detach #rmdev -dl sit0 #ifconfig cit0 detach #rmdev -dl cit0 Set the startup script /etc/rc.net to call autoconf6 with the -6 argument to prevent setting up 6 to 4 tunnels.

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