Comment 4 for bug 114184

I have created a patch which enables the RT extension. This patch is a one line change, and can be added by anyone.

This does need to get applied to both Ubuntu 6.10 and 7.04.

This is a security problem, and machines without this patch and without the latest kernel version are vulnerable to DoS attacks, and to being a relay of a DoS attack.
Machines without this patch are also totally vulnerable to a particular type of rule bypass attack, where malicious hosts can send packets to hosts that are supposedly protected behind firewalls [1].

[1] http://www.ietf.org/internet-drafts/draft-ietf-v6ops-security-overview-06.txt