Sat, 13 Sep 2003

Stealthing Port 113 on D-Link DI-604 Router

In recent days, the most frequent Google searches leading readers to my site seem to have come from people trying to figure out how to stealth port 113 or their D-Link DI-604 Routers.

I wrote an article titled Dropping IDENT requests causes e-mail delays explaining why, in some cases, you may not want to stealth port 113. The article does not explain how to stealth port 113, if that is what you want. This article adds that information.

You may want to review the prior article, first, to determine if that's what you really want to do. If so, the solution is quite simple.

To stealth port 113 on D-Link DI-604 Router simply forward port 113 to an unused IP address on your network using the technique described in the D-Link TechSupport FAQ.

Some routers, such as the Netgear RP614 automatically stealth port 113. If you experience delayed connections to outbound services like SMTP and IRC, you may want to un-stealth port 113 so packets are refused instead of dropped.

To un-stealth port 113 on Netgear RP614 (or many other routers), forward port 113 to an active IP address on your network that responds with a closed port. In my prior article, I forwarded port 113 to a network connected HP printer. For the RP614, see the port forwarding instructions in the reference guide.

In either case, you can use Steve Gibson's excellent ShieldsUp!! page to test the results of your configuration change.

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