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Multiple NAT entries pointing to the same location

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  • Multiple NAT entries pointing to the same location

    Working with a Cisco 2811 router.

    The situation is I want to forward port 25 external to port 25 on serverA internal and forward port 2552 external to port 25 on serverA internal.

    It seems I can't do this. After running this command:
    Code:
    ip nat inside source static tcp 172.18.21.66 25 interface FastEthernet0/0 2552
    I get the message:
    Code:
    %Static entry in use, cannot change
    Is there a way to accomplish forwarding both external ports to the same port internally?
    Regards,
    Jeremy

    Network Consultant/Engineer
    Baltimore - Washington area and beyond
    www.gma-cpa.com

  • #2
    Re: Multiple NAT entries pointing to the same location

    AFAIK, no you can't use the same port in multiple nat entries with the same ip addresses..
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

    Comment


    • #3
      Re: Multiple NAT entries pointing to the same location

      Agreed you cannot do this, you could setup another smtp server though on a different IP on the same server maybe?
      cheers
      Andy

      Please read this before you post:


      Quis custodiet ipsos custodes?

      Comment


      • #4
        Re: Multiple NAT entries pointing to the same location

        This can be interesting to read if you want to know more about NAT
        http://www.cisco.com/en/US/docs/secu...de/cfgnat.html
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
        "If you're going through hell, keep going. ~Winston Churchill"

        Comment


        • #5
          Re: Multiple NAT entries pointing to the same location

          Originally posted by AndyJG247 View Post
          Agreed you cannot do this, you could setup another smtp server though on a different IP on the same server maybe?
          That could be a very good option if possible
          Marcel
          Technical Consultant
          Netherlands
          http://www.phetios.com
          http://blog.nessus.nl

          MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
          "No matter how secure, there is always the human factor."

          "Enjoy life today, tomorrow may never come."
          "If you're going through hell, keep going. ~Winston Churchill"

          Comment


          • #6
            Re: Multiple NAT entries pointing to the same location

            Nuts. I'm sure there's a logical, technical explanation for why this functionality isn't available but it escapes me at the moment.

            Thanks for the suggestion Andy. That would probably work but this is now more out of curiosity because the need for the entry will be gone in about 2 hours (waiting for DNS propagation). I may try it out just to see if it works.

            Thanks for the replies guys.
            Regards,
            Jeremy

            Network Consultant/Engineer
            Baltimore - Washington area and beyond
            www.gma-cpa.com

            Comment


            • #7
              Re: Multiple NAT entries pointing to the same location

              Could you not give the server a second IP address on the same NIC, and forward port 2552 to that?


              Tom
              For my own and your protection, I do not provide support by private message under any circumstances. All such messages will be deleted and ignored.

              Anything you say will be misquoted and used against you

              Comment


              • #8
                Re: Multiple NAT entries pointing to the same location

                Originally posted by Stonelaughter View Post
                Could you not give the server a second IP address on the same NIC, and forward port 2552 to that?
                Yes, I believe that will work. Just like Andy suggested. Unfortunately I probably won't bother trying it as I have too many other things to do. (like relax )
                Regards,
                Jeremy

                Network Consultant/Engineer
                Baltimore - Washington area and beyond
                www.gma-cpa.com

                Comment

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