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NAT Error in Actiontec (FIOS) Router Security Log

I am repeatedly finding this error in the security log of my Actiontec FIOS router:

NAT Error: Conflict Mapping already exists LAN 192.168.1.4 dev clink0 protocol PROTO 41 [repeated 12 times, last time on Dec 6 18:46:14 2009]

The LAN address in the message varies between our two Windows 7 PCs, and the number of repetitions varies, too, sometimes occurr over 100 times (e.g., "repeated 121 times, last time on . . ." ).

Our network seems to be behaving properly, but I do not understand why this error is occurring, nor do I understand why it is happening repeatedly and so often, nor do I know whether it is a symptom of something troublesome but just not evident.

The Actiontec manual is of no help. It says only this: "NAT Error: Conflict Mapping already exists - a conflict occurred because the NAT mapping already exists, so NAT failed." This little bit helps me not at all.

If anyone does understand, I'd very much appreciate being enlightened.

Thanks.

Comments

dslr595148

Here is my educated guess on what to do.

Turn off UPnP in the router.

MelRaff

Actually, I did that already. What I was seeing was that as soon as that error appeared in the log, a new mapped port would appear (to the same IP address listed in the error message). I would delete it, but it would reappear at about the same time as the error message. So I disabled UPnP on the router, but the error messages continue. The mapped port, of course, no longer reappears, but the router continues to log these same errors.

dslr595148

What is the exact model and version of that Actiontec?

For example MI-424 Ver C

MelRaff

It's an MI424-WR, Rev D; firmware version 4.0.16.1.56.0.10.11.6.

Mel

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