Hi, To implement either 1) or 3) you need to mix iptables and iproute2 to route packages matching specific criteria. The "Linux Advanced Routing & Traffic Control HOWTO" has a specific section on this, and an example very similar to yours (although they show how to route outgoing e-mail traffic and not incoming). See this URL: http://lartc.org/howto/lartc.netfilter.html However, I still think you should re-evaluate your requirements, think of what you're trying to accomplish, and re-architecture your solution based on that. HTH, Filipe