NAT & Routing

[jfeo]

I been using static nat and has been cumbersome to manage. For example I will do a /24 static nat to make all the NATs are known for monitoring. Question came up that can we NAT a subnet and they will always line up with last octet the same

example

ip nat inside source static network 10.10.10.0 192.168.1.0 /24

10.10.10.1 will always get 192.168.1.1 

10.10.10.240 will always get 192.168.1.240

[Georg Pauwen]

Hello,

I don't think this is possible. If you want the last octets to match, you need individual entries:

ip nat inside source static 10.10.10.1 192.168.1.1

ip nat inside source static 10.10.10.2 192.168.1.2

ip nat inside source static 10.10.10.3 192.168.1.3

etc.

etc.

etc.

[paul driver]

Hello

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@jfeo wrote:

I been using static nat and has been cumbersome to manage. For example I will do a /24 static nat to make all the NATs are known for monitoring. Question came up that can we NAT a subnet and they will always line up with last octet the same

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Yes you can , either statically or dyamically

Example of Dynamic nat matchng host
access-list 100 permit ip 10.10.10.0 0.0.0255 any
ip nat pool Nat-Host 192.168.1.2 192.168.1.253 prefix-length 24 type match-host
ip nat inside source list 100 pool Nat-Host

The above nat example will nat inside local hosts residing in the 10.10.10.0 /24 subnet to its related natted inside global ip address of 192.168.1.x

[jfeo]

Ok that is how I can match the end host. Can I apply this do any VRF?

[paul driver · Accepted solution]

Hello

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@jfeo wrote:

Ok that is how I can match the end host. Can I apply this do any VRF?

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 ip nat inside source list 100 pool Nat-Host vrf xxx