Reverse Routing

Answered Question
Jul 19th, 2008
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Hi below i am enclosing basic view of my network.


I configured Nat Exemption in my ASA 5520

nat (inside) 0 172.20.0.0 255.255.0.0


route in ASA as

route outside 0.0.0.0 0.0.0.0 122.x.x.33 1

route inside 172.0.0.0 255.0.0.0 172.x.x.1 1



and configured PAT over my 2801 router inside interface where there is a route as follows


ip route 0.0.0.0 0.0.0.0 122.x.x.50

ip route 172.16.0.0 255.240.0.0 122.x.x.44


and my doubt is i want to configure PAT over my ASA 5520 and remove NAT in 2801 router how can i change the ROute commands in both ASA and Router


Please Help me in this regard



Correct Answer by victor_87 about 8 years 9 months ago

As far as i see, you do not need to change any route's commands.


however you may remove

ip route 172.16.0.0 255.240.0.0 122.x.x.44


as the firewall outside and router inside are directly connected, which consideration i made after reading the following statement "configured PAT over my 2801 router *inside* interface"

Keeping the route wouldn't cause any problem anyway.





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dhananjoy chowdhury Sat, 07/19/2008 - 20:46
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On the 2801 router :-

remove the IP NAT statements and also remove

ip route 172.16.0.0 255.240.0.0 122.x.x.44


On the ASA box (to PAT with the outside interface IP): -

no nat (inside) 0 172.20.0.0 255.255.0.0

nat (inside) 10 172.20.0.0 255.255.0.0

global(outside) 10 interface


Hope this helps.

Correct Answer
victor_87 Mon, 07/21/2008 - 07:25
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As far as i see, you do not need to change any route's commands.


however you may remove

ip route 172.16.0.0 255.240.0.0 122.x.x.44


as the firewall outside and router inside are directly connected, which consideration i made after reading the following statement "configured PAT over my 2801 router *inside* interface"

Keeping the route wouldn't cause any problem anyway.





Remember to Rate me if helpful.

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