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SNMP and NAT

Posted on 2002-06-27
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Last Modified: 2011-10-03
I have read that when you NAT an address you can't do SNMP gets on that address, but I tried anyway and, sure enough, it doesn't work. But I can't see why. I don't see a hex equivalent of the IP address anywhere in the SNMP packet except for the destination IP address.

Any ideas?

Steve
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Question by:SteveJ
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scraig84 earned 400 total points
ID: 7115169
Hey Steve,
I could have sworn that this was purely a limitation of certain implementations of NAT.  For example, I am pretty certain that the PIX will allow it but the Cisco IOS NAT will not.  I could be wrong on that though.

Also, when looking at the hex, did you only look at the request or did you also look at the payload of the response?  

I am also assuming you put a static NAT rule in place for this?

Go Vikes  :)
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by:SteveJ
ID: 7115204
There must be another problem. I NATed another address successfully. I used Cisco NAT, static . . . and there was no reply. It's as if Im using the wrong community string or something because the stupid router increments the "unknown community name" counter even though Im using the correct community name. Just for the heck of it, I set the RO to public and the RW to private with the same results. I may need to power cycle the box . . . which is in Tucson, AZ. I'll keep digging.

Yeah, right "go Vikes"

Steve

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