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NAT1:1 Multiple external IPs pointing to same internal IP

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  • R
    Rapture
    last edited by Jan 27, 2011, 2:01 PM

    Hi all,

    I know that 1:1 NAT-ing from nulitple external IPs to a single internal IP is not recommended. But could someone please educate me as to why it is not a good idea.

    TIA

    Melvin

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    • J
      jimp Rebel Alliance Developer Netgate
      last edited by Jan 27, 2011, 6:53 PM

      Because when traffic goes out, which IP is it supposed to use? Incoming connections may be OK, but outgoing connections would likely never use the second IP, no matter what you do.

      Specific port forwards and outbound NAT rules (or in 2.0 1:1 NAT rules for different IPs but with source/destination restrictions) should be OK, but just putting two whole external IPs to the same internal IP isn't likely to be what you really want to do.

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      • R
        Rapture
        last edited by Jan 28, 2011, 10:18 AM

        Hi Jim, Thanks for the clarification. Makes perfect sense.

        Melvin

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