I compiled with secessfull module P2P to iptables on CENTOS 4.2, but after the Centos load ipt_p2p.ko the kernel PANIC.
# modprobe ipt_p2p <- after load, Kernel PANIC
Sounds like you need to ask this question of the iptables-p2p people.
-- "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety'' Benjamin Franklin 1775