netfilter: Redirecting incoming udp packets to other port

Discussion in 'Linux Networking' started by muruga, Dec 11, 2006.

  1. muruga

    muruga Guest

    I want to redirect incoming udp packets comming to router to only
    go out from a praticular port. will it be possible by using iptables
    command. will the command change skbuff contents and tuple. Do reply
    packets will be the routed properly.


    client ------------> router -------------------->server
    <----------- <--------------------

    if receive a orignal udp packet from client from client port x to
    router port y, can i use the same port y to forward to server (y acting
    as source port) and then receive the reply packet to port y as
    destination and successfully forward to client port x.

    will the cmd like will work
    iptables -A POSTROUTING -t nat -p udp --dport y --sport y -j MASQUERADE

    can any one give idea

    thanks in advance
    muruga, Dec 11, 2006
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