I am seeing the same problem. In addition, the OpenVPN stopped working. Going back to the 2.5 kernel fixes both issues.
Shorewall 3.0.7-1 Openswan 2.4.5-3 self-compiled kernel 2.6.16.18 (non-working), 2.6.15 (working) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

