Question re: applying nat to an interface

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Sep 14th, 2007
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I am working on a 2801 router that has been set up with nat on the inside and outside interface as so:

interface Outside

ip nat outside

interface Inside

ip nat inside

ip nat inside source route-map SDM_RMAP_1 interface FastEthernet0/0 overload <<this is the outside interface

The last router I worked with only had this applied to the outside interface, is there an advantage to putting it in either place? is it proper to have it in both places? could it cause problems having it on both interfaces? Is it only working on the one interface because that is where the route map is set to?

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Jon Marshall Fri, 09/14/2007 - 13:59
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Hi Dan

Not sure i follow what you are asking. You have to have both an "ip nat inside" and an "ip nat outside" otherwise the router does not know in which direction to apply the NAT.

Have i misunderstood the question ?


dan.tesch Fri, 09/14/2007 - 14:19
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I'm sure you understood the question, I just thought the last router I was working on only had the ip nat command applied to one interface. I must be mistaken if that is the proper format. --Thanks!


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