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From: Martin Koenig (lists_at_mkoenig.com)
Date: Tue Jul 16 2002 - 14:39:25 CDT

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    Hi Anonymous,

    > What is the best way to forward TCP and UDP ports from
    > one computer to
    > another?

    Assuming you use NAT and 2.4 kernel:

    iptables -A PREROUTING -t nat -p [PROTO] --dport [PORT] -i [I_IF] -j
    DNAT --to [DEST]

    [PROTO]: tcp / udp
    [PORT]: Port on public IP, the one you wish to forward
    [I_IF]: incoming (public) interface ( e.g. ppp0 )
    [DEST]: destination ip:destination port

    // Martin Koenig

    PS: Why not use your real Name?
    PPS: Now what part of your question exactly was security-related? 

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