Change TTL using iptables

[Guest flshg]

I'm not an expert in linux, but from a bit of research, iptables can change the ttl value when forwarding packets, but seems it needs support from the kernel to work on the ttl bit. I tried running 'iptables -t mangle -A PREROUTING -i eth0 -j TTL --ttl-set 64' but it doesnt like the --ttl-set.

Anyone know if a different rom supports this, and whether the command is correct (or should use --ttl-set 65)?