That is considered unacceptable behaviour.... To be a good gateway in the IPIP tunnel system you need to setup tunnels to all the other systems in the network. I think it currently does not even work anymore as the UCSD system now blocks such wrongly routed traffic. In a Linux system as a router, you need only one tunnel interface and the tunnel endpoints are defined in the route table (can be put in a separate route table when you want to use the same system both for internet and 44-net) That route table is automatically kept uptodate using a RIP daemon like ampr-ripd. Simple one-time setup and no more need to look after it and run regular scripts that fetch files and send commands. When someone changes their external address or subnets they route, your system will know about it after 5 minutes. But when you want to do it the difficult way, please go ahead! After all, learning and experimenting is what it is all about. Ready and working setups are not as interesting as finding out yourself how it all works and what are advantages and disadvantages of each method. Rob