um--on fedora core 1--which seems to match the versions you provide, the TTL match target is there. $ uname -r 2.4.22-1.2197.nptl $ iptables -V iptables v1.2.9 # iptables -A INPUT -m ttl --ttl-eq 1 -j DROP # # iptables -vnL INPUT Chain INPUT (policy DROP 184 packets, 19161 bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 TTL match TTL == 1 -j -----Original Message----- From: netfilter-admin@xxxxxxxxxxxxxxxxxxx [mailto:netfilter-admin@xxxxxxxxxxxxxxxxxxx]On Behalf Of Gonzalez, Federico Sent: Friday, July 23, 2004 1:52 PM To: netfilter@xxxxxxxxxxxxxxxxxxx Subject: TTL target Hi, I have iptables 1.2.9, red hat kernel 2.4.22 and i need to use the TTL target to change the packets TTL. How do i enable this functionality ? Thank you.