NAT pool using different subnet than interface address

Answered Question
Aug 16th, 2010

Hello Everyone,

I have a Cisco ASA wherein I have configured 5 interfaces consisting of inside, outside, dmz1, dmz2 and vpn. When we are natting interfaces from the internal networks to outside, can we use a subnet that is different from the interface subnet? For example the outside interface address is 192.168.10.1/24, can we use nat pool with another subnet such as 172.16.10.0/24? My understanding would be to add routes to allow traffic to use the subnet.

Thanks

I have this problem too.
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Correct Answer by Jon Marshall about 6 years 5 months ago

sidcracker wrote:

Hello Everyone,

I have a Cisco ASA wherein I have configured 5 interfaces consisting of inside, outside, dmz1, dmz2 and vpn. When we are natting interfaces from the internal networks to outside, can we use a subnet that is different from the interface subnet? For example the outside interface address is 192.168.10.1/24, can we use nat pool with another subnet such as 172.16.10.0/24? My understanding would be to add routes to allow traffic to use the subnet.

Thanks

Yes, you can use any subnet you want as long as that subnet is routed back to the outside interface of your ASA.

Jon

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Correct Answer
Jon Marshall Mon, 08/16/2010 - 17:26

sidcracker wrote:

Hello Everyone,

I have a Cisco ASA wherein I have configured 5 interfaces consisting of inside, outside, dmz1, dmz2 and vpn. When we are natting interfaces from the internal networks to outside, can we use a subnet that is different from the interface subnet? For example the outside interface address is 192.168.10.1/24, can we use nat pool with another subnet such as 172.16.10.0/24? My understanding would be to add routes to allow traffic to use the subnet.

Thanks

Yes, you can use any subnet you want as long as that subnet is routed back to the outside interface of your ASA.

Jon

mirober2 Thu, 10/28/2010 - 13:00

Hi Brenda,

See Jon's answer above your post. He answered the previous poster that this can be done.

-Mike

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