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  1. #1

    iptables filtering GRE traffic


    I am wondering if iptables can filter TCP traffic that's inside a GRE tunnel. Does iptables look for protocol field of the innermost IP or the outermost IP?


  2. #2
    Linux User vickey_20's Avatar
    Join Date
    Mar 2009
    Mumbai, India
    What is a GRE tunnel??
    heres a good iptables tutorial
    Iptables Tutorial 1.2.2
    Only if I could understand the man pages
    Registered Linux user #492640
    OS: RHEL4,5 ,RH 9,Ubuntu

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