OK, more details: Existing system communicates between 2 2.4.x systems. 2 userspace QUEUE targets intercept data in the mangle table with conntrack loaded for defragmenting. The userspace does some packet mangling, mainly data contents. With the 2.4.x machines, works fine. I loaded a machine with Fedora RC2 (2.6.5-1.358). Put the userspace on without any issues. When just examining the packets, passes thru fine. The issue seems to be when I get a packet of around 2360 bytes. Right around that size the tail end of the packet seems to be garbage (I hexdump the last 32 bytes of the packet on sender and receiver). With 2.6.5, are there any known issues with conntrack and large packet mangling? __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail