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    SubjectIPIP Tunneling

    I am just about at wits end trying to get ipip tunneling working with
    2.2.x


    Example configuration:

    System A has:

    192.168.50.254
    172.16.0.254


    System B has:

    192.168.50.107
    10.1.1.1

    (This is a lab environment)

    I have the iproute tools installed.

    My goal is to create a tunnel between sysA and sysB so that traffic
    between the 172.16.0.0/16 and 10.1.1.0/24 is routed over the tunnel.

    I have tried just about everything. The procedure that should be most
    promising:

    On system A:

    insmod ipip
    ip tunnel add tun0 mode ipip remote 10.1.1.1 local 172.16.0.254
    ip addr add 172.16.0.254 dev tun0
    ip link set tun0 up
    ip route add 10.1.1.0/24 dev tun0

    On system B:

    insmod ipip
    ip tunnel add tun0 mode ipip remote 192.168.50.254 local 10.1.1.1
    ip addr add 10.1.1.1 dev tun0
    ip link set tun0 up
    ip route add 176.16.0.0/16 dev tun0

    None of the commands complain.

    When I attempt to ping 172.16.0.254 from sys B, I can see the packets
    arrive on the 192.168.50.254 interface ... tcpdump says that an icmp echo
    request has arrived and it sees it as ipip. It never tries to send a
    reply. Exactly the same happens at the other end. I can see the pings
    arrive but it never seems to even try to reply. It is as if the ipip
    packets arrive but are not being decapsulated (my speculation only).

    Is the above not the proper way to configure the tunnel? Is there a better
    way?



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