I'm having a real difficult time configuring one-to-one NAT on my RV016. It's running firmware 2.0.6. Currently, I have WAN1 (IP WAN.98) and DMZ (IP WAN.99) set up correctly. The DMZ Host is pointed at LAN.2. This set up is necessary so that I can easily undo my any changes I make as I try to move up to One-to-one NAT. When I disable the DMZ port (ixp8) and disable the DMZ host, my one-to-one NAT rule should come into play: LAN.2~29 => WAN.99~126 I've set up access rules to: allow SMTP from WAN1 ANY to LAN1.2 The access log says that this connection is accepted. If I delete the rule, the connection is rejected. But the connection never actually is made! I'm using telnet to port 25 to test my connections. I've set up a web server, too, and the necessary access rules. Perhaps because my web server's timeout is greater than the default for telnet, I do get a connection, but it's awfully and unreasonably slow. A page that should appear in 1 or 2 seconds takes at least 2 minutes to even begin to render. I've already tried talking to the Linksys tech support. Absolutely useless. Is one-to-one NAT broken in RV016? Is there some trick? Do I have to use the DMZ port for the one-to-one NAT? Does static DHCP affect one-to-one NAT? Can I do one-to-one NAT with the RV016 in gateway mode instead of router mode? I have noticed two strange issues in the logs: 1. This appears in the log whenever I change the firewall access rules or general settings: Failed nat control SIOCADNAT - File exists Failed to add rule File exists I've tried resetting the firewall to defaults, but this still appears in the log. 2. If I leave the DMZ port enabled but disable the DMZ host, WAN traffic that should be subject to the One-to-one NAT rules arrives through the DMZ port (ixp8) and is accepted even though the firewall access rule says it should be allowed only from source WAN1 (ixp1). If I disable the DMZ port, the traffic comes through WAN1 and is accepted. The result is the same each way, though: no actual viable network connection. Strangely, if I change the firewall access rule to allow from interface DMZ (but not WAN1) and I leave the DMZ port enabled, all traffic subject to the one-to-one NAT rule arrives on the DMZ port but is rejected.