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  1. #1

    iptables redirecting to different port


    I am trying to figure out a method to redirect UDP traffic to a single socket to userspace app using iptables. My system runs on 2.4 kernel and currently NAT is not used.

    After some analysis i figured out iptables can be used to redirect traffic based on matching rules to a different port. my assumption is that i can add a rule in input chain of filter table to divert udp traffic within source port ranges to a new port.

    when i tried to use the follwing command
    iptables -t filter -A INPUT -i eth0 -p udp --sport 9000:9010 -j REDIRECT --to-ports 9050
    it returns as Invalid argument

    Please help me with the above rule - is my assumption correct?
    will any other method or rule will be required?


  2. #2
    Linux Guru Lazydog's Avatar
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    Jun 2004
    The Keystone State
    Please see this IPTABLES TUTORIAL.


    The adventure of a life time.

    Linux User #296285
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