From Oracle Linux 5 Security Technical Implementation Guide
Part of GEN005610
Associated with: CCI-000366
If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices.
Check if the system is configured for IPv6 forwarding. # grep  /proc/sys/net/ipv6/conf/*/forwarding|egrep "default|all" If the /proc/sys/net/ipv6/conf/*/forwarding entries do not exist because of compliance with GEN007720, this is not a finding. If all of the resulting lines do not end with 0, this is a finding.
Disable IPv6 forwarding. Edit /etc/sysctl.conf and add a setting for "net.ipv6.conf.all.forwarding=0" and "net.ipv6.conf.default.forwarding=0". Reload the sysctls. Procedure: # sysctl -p
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