If you forget to permanently save your new NAT rules, and then reset your modem, the new NAT rules wil go away. Once they go away, they will not work as expected.

Also, if you reboot your server, and it turns out that you never got around to saving the new network settings to the appropriate config files, those new network settings will also go away. If this means that the server is now looking for a default gateway that is on the wrong subnet, routing to the outside world will become something of a hit-and-miss affair.

Mostly miss, really.

And it looks like I may have been unfair to my D-Link modem. When entering a NAT rule, it asks for from and to local addresses (invariably one machine), from and to remote addresses (invariably your external IP, but you could have more than one of those), from and to port numbers... And a single to port for the final destination. So it looks like after typing everything in twice, you are restricted to only handling one port per rule. And you can only have twelve rules, so...

But no! If you leave the destination port as zero, it seems that the port number is passed through unchanged. So I can handle the standard BitTorrent ports (6881-6889) with a single rule! Hurrah!

I have absolutely no idea how I managed to enter the number 7 for that final port, but I can tell you that it did not work.

Posted by: Pixy Misa at 11:06 PM | Comments (4) | Add Comment | Trackbacks (Suck)