ASA5520 NAT problem - 2 global commands

Unanswered Question
Jul 20th, 2009
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Hi @all,


there's something I don't understand. We have an ASA5520.


We also have some wireless LANs. The clients of the one wireless lan (wlangaeste) are natted to an ip address (x.x.x.x) behind the outside interface. That's working fine.

But the clients of another wireless lan (wlanherm) should be natted to an ip address (y.y.y.y) of one of the inside interfaces and this is not working.


There's always the message:

Portmap translation creation failed for udp src wlanherm: 192.168.248.22/54679 dst outside: x.x.x.x


The config is:


global (outside) 10 x.x.x.x netmask 255.255.255.255

global (herm) 20 y.y.y.y netmask 255.255.255.255

nat (wlangaeste) 10 192.168.247.0 255.255.255.0

nat (wlangaeste) 10 192.168.247.0 255.255.255.0 outside

nat (wlanherm) 20 192.168.248.0 255.255.255.0

nat (wlanherm) 20 192.168.248.0 255.255.255.0 outside


Can anybody say me what's wrong with the config? I don't understand why the destination in the message is the outside-Interface. It should be the herm-Interface for the 192.168.248-network.


Greetings Lydia


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lydia.walther Wed, 07/22/2009 - 03:38
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Maybe the problem is, that PAT (and the ASA says it's doing PAT) is only working in "Outbound" direction?

And we are trying to do it from an inside subinterface to another one.



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