I thought a DMZ set up would work but I can't get the LAN nodes to talk to the servers indside the DMZ. I'll explain our setup. ISP has defined a WAN address for us of (example) 220.127.116.11 and also allocated us an address range under under a slightly different address subnet of: 18.104.22.168 range through too 22.214.171.124. The address range is for us to use for our mailserver,webserver and other services we need a static IP for, the WAN address for general web traffic. Their is a modem which sits infront of the RV which just connects us to the ISP and forwards all traffic to the RV. I've set up the RV042 to work in DMZ mode, and set the WAN IP to 126.96.36.199 and for the DMZ I set the DMZ "mode" to Subnet (as the WAN IP and the IP range are in different subnet's) When set up like this, the servers inside the DMZ can talk happily to the outside world, and the outside world can talk to them. The nodes inside the LAN can talk to the outside world but not to the servers in the DMZ (connecting to their static WAN IP). I made a firewall rule allowing port 25 traffic for example from ANY source, through to an IP in the DMZ.. and I can see a hit on the firewall log from a LAN IP, saying connection accepted but nothing actually makes it to the mailserver. Where have I gone wrong?