Hi, Finnaly I managed to load ip_conntrack_rtsp and ip_nat_rtsp into my 2.6.9 kernel. I would like to SNAT each RTSP session, but it doesn't seem to work right -- it only works for one RTSP session. I may have configured iptables wrong. Appreciate if someone can send me a sample config for rtsp or point out any errors in my iptables command below: iptables -t nat -A POSTROUTING --protocol tcp --dport 554 -m state --state NEW -j SNAT --to-source 10.9.0.1-10.9.0.10 iptables -t nat -A POSTROUTING --protocol udp -m state --state RELATED,ESTABLISHED -j SNAT --to-source 10.9.0.1-10.9.0.10 This box is acting as a router between RTSP client(s) and server(s) Thanks, Khoa