Hi, at the moment i'm poking around with some extensions in the sip-conntrack-module. Want to have: forwarding of pakets to different destinations, depending on their conntrack-state. In the conntrack-help: if (localnet == (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip & localnet_mask)) return NF_ACCEPT should say: no change to pakets comming from inside. all others, i want to forward to an internal host, so i write: if (ip_nat_forward_hook) ip_nat_forward_hook(pskb, ct, ctinfo, dptr,my_inet_addr(sip_proxy_ip)); and in nat_forward: (clearly another module) ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip = fwd_ip; (*pskb)->nh.iph->daddr = fwd_ip; after that, the udp csum and ip-csum are recalculated. So now the problem: it simply don't work. but wheres the error in reasoning ? tcpdump sees the pakets, dest-addr is the internal. cat conntrack: the tuple looks like it should Or is there another way i can achieve the thing ? thanks in advance Martin -- "Feel free" – 10 GB Mailbox, 100 FreeSMS/Monat ... Jetzt GMX TopMail testen: http://www.gmx.net/de/go/topmail -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/