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  • "Special" one to one NAT

    Hi everyone,

    I need to do something which I know it is possible but cant get my keywords right in google to find out about it!

    It is a one to one NAT which keeps the host address as it is between two different subnets of the same length. Something "Statically dynamic".

    For example lets take a 24 bit subnets for simplicity.

    I would like to nat that way. (both subnets are 24 bit in length)

    192.168.1.1 NAT to 172.16.1.1
    192.168.1.2 NAT to 172.16.1.2
    192.168.1.3 NAT to 172.16.1.3
    192.168.1.4 NAT to 172.16.1.4
    and so on ...

    I dont mind that a solution is given for a router or firewall but preffered for a cisco device , but please reply if you have done with another vendor.

    Another thing is, how is it called? is there a name for this sort of NATing?

    Thank you,

    Niltinho

  • #2
    Re: "Special" one to one NAT

    are you reffering to the "ip nat inside source static network" command?
    that's with a Cisco router.

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    • #3
      Re: "Special" one to one NAT

      Thanks for your reply

      idos, indeed this is the static NAT command for IOS.

      But what I am looking here is not necessarioy the "the command" but how what i have discribed is done.

      This comand creates a static NAT entry, so in my example for a 24bit subnet i would need 254 NAT entries!

      Thank you anyway,

      Nilton

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      • #4
        Re: "Special" one to one NAT

        Are you possibly referring to configuring a "nat pool"?

        If so, see the following cisco.com link: NAT POOL

        Based on your post, the "Access List Approach" probably meets your requirements. If you need more granularity, then take a look at using the "Route Map Approach".

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        • #5
          Re: "Special" one to one NAT

          I think you'll need to create every static NAT entry that you need. I don't think there's any way of creating a NAT pool that says "NAT the outside x.x.x.1 address to the inside x.x.x.1 address, and so on and so on". Which is what I think you're trying to explain in your post, correct?

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          • #6
            Re: "Special" one to one NAT

            Thanks joeqwerty,

            That is what i am trying to do, and i am sure it can be done "dynamic" as I have seen this been done before.

            Cheers

            Nilton

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