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Hello, I would like to create a gateway in order to do a special kind of NAT. I need to do SNAT and DNAT in this way : SNAT : ...
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  1. #1
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    problem of gateway: SNAT, DNAT and netfilter


    Hello,
    I would like to create a gateway in order to do a special kind of NAT.
    I need to do SNAT and DNAT in this way :

    SNAT :
    @src A.X.Y.Z -> A+1.X.Y.Z
    Example:
    @src 192.168.0.1 -> 193.168.9.1
    @src 191.23.33 -> 192.23.33

    DNAT :
    @dst A.X.Y.Z -> A+1.X.Y.Z
    Example:
    @dst 168.1.0.1 -> 169.1.0.1
    @dst 154.9.2.36> 155.9.2.36

    I know how to do it with "static list" of @IP with iptables :
    DNAT :
    iptables -t nat -A PREROUTING -d 192.168.0.1 -j DNAT --to-destination 193.168.0.1
    SNAT
    iptables -t nat -A POSTOUTING -s 168.1.0.1 -j DNAT --to-destination 169.1.0.1

    But, as I have a large number of @IP, how can I do it for ALL ip addresses ?

    Thank you for giving few secondes to explain me how to do it if you have an answer.
    Thank you !

  2. #2
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    Hum, am I clear ?

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