NAT - T needs no change of config in paragraph 12.2 (15) T10

I've updated to 12.2 (8) to 12.2 (15) T10 T10 to take advantage of the NAT - T functionality. I was under the impression that I don't have to make any changes to the config - especially inbound ACL. What I found though, is that I have to add:

access-list 100 permit udp any host 67.X.Y.Z eq 4500 for incoming to go beyond IKE client connections.

The UDP 4500 eq gets translated by IOS UDP eq "non500-isakmp" is said by the way.

I'm missing something here?

You don't have to make changes of command crypto, the router will automatically negotiate to use NAT - T without doing you anything.

If the NAT - T is traded, then all the packages will be encapsulated in UDP/4500 packages, of course if you have an inbound access list need to then allow these packages, otherwise they will simply abandoned on the interface. The "non500-isakmp" is just the naming convention that the guys of IOS with came to signify the NAT - T packets.

Tags: Cisco Security

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