So, I have an RV042 (firmware: official 188.8.131.52), with cable modem on WAN1, DSL modem on WAN2, setup in load balance and have shaped the traffic a bit with protocol binding; essentially things are "good" and all works well, but I'm having an issue with forwarding ports... We recently added the second WAN and upgraded the firmware (it was still on the original garbage) and after that was done, things worked great, we already had some port forwarding that was setup, like for mail to our primary mail server, DNS and a couple others, and it all still worked... So, anyone having used this knows the router has "Forwarding" and you tell it what services are to goto what IP inside your lan, and that works great... but as we've added the second connection, I need to be able forward the ports accessed on that IP to another IP inside the lan as we have a secondary mail server. It currently forwards the ports to the same internal server regardless of the WAN address the port is accessed on, meaning it treats WAN1IPORT and WAN2IPORT the same and forwards both connections to LANdestIPORT, thankfully the responses go back out through the correct WAN interface regardless of where protocol binding is set for that LAN ip... Now, I am already using the One-to-One NAT for another application, but it is forwarding to a Linux box, so I'm not concerned about it being 100% exposed to the internet, whereas the secondary mail server is another Windows 2003 Server, and I don't want to just sit that thing open the 'net... I currently am attempting to use another One-to-One NAT pointing to another Linux box to act as a firewall of sorts for the secondary mail server, but the problem I'm running into of course is that now I have a double NAT, and it's not working... Any alternatives to this, or suggestions for solving this problem would be excellent... In my head, I imagine that there MUST be a way to have the router do it's port forwarding bound to specific IPs, as if this were any basic Linux box, it would be a simple matter of being more specific in the iptables rules, but I don't know enough about the internals of the RV042 yet, so I'm hoping anyone here might be able to help.