Multiple public IP's to 1 internal IP

Unanswered Question
Mar 16th, 2007


We have an ASA 5520 running in front of our web farm. We now have 5 public IP's that need to be forwarded to 1 internal IP, on the same port.

Our network guys tell us this is not possible !? Any ideas ??



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hoogen_82 Fri, 03/16/2007 - 04:08

Hi Stefan,

Your requirement is quite unusual. But as your network engineers suggest there cannot be port forwarding done to the same server. But what we can do is this

global (inside) 1 x.x.x.x

that x.x.x.x is your internal ip.

and nat (outside) 1 y.y.y.y- y.y.y.z netmask

thats the range of your outside IP. Also remember to put the right access-list on your outside interface to allow access.


stefan.avgousta... Fri, 03/16/2007 - 04:36

Hi Hoogen,

Is it that unusual ? What if you host multiple websites on 1 physical server = 1 IP. And you have muliple public IP addresse pointing from the outside to that server e.g. consolidation but and you don't wanna change DNS entries.

I have no problem doing this on other products

Bit strange that the ASA can't do it.




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