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No Nat Control

jiggin23
jiggin23 asked
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Last Modified: 2012-08-14
We have an ASA 5540.  I issued the command "sh run nat-c" and it comes back "no nat control'.  From my understanding this means that traffic should pass through the firewal w/o nat transaltion.  The problem is that I couldn't ping from one subnet to antoher, and the subnets are out different interfaces on the ASA.  As soon as I put in a nat exempt statement in the ASA on the source interface it worked fine.  Why would this be if the "no nat control" command is issued??  Thanks for your help.
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It probably meant that you don't have either nat command or nat exclusion. One thing to remember is that even if you want to have 'non-natted' services, you need to nat it. What it means is, nat it to the same ip.

2 ways of getting around it. Say you have an ip 1.1.1.1 which you don't want to nat, then you still nat it, but you nat it to itself, or include a nat exclusion command. Both works the same way.

First -> static (inside, outside) 1.1.1.1 1.1.1.1 netmask 255.255.255.255

Second -> nat exclusion which you obviously know.

Cheers,
Rajesh

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