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    SubjectSpoof protection with redundant routes

    I have a box with two redundant CIPE tunnels to a
    remote network 10.36.x.x.

    Routing table:

    Destination Gateway Genmask ... Iface
    ... UH 0 0 0 cipcb3 UH 0 0 0 cipcb1 UG 0 0 0 cipcb3 UG 0 0 0 cipcb1

    Now when a packet comes in from on cipcb1, the
    spoof protection kills it, since the outgoing packet would
    take the route via cipcb3 which is first. I didn't quite
    expect that initially.

    - Is that known and by design?
    - Is that the desired behaviour?
    - Is there some possibility to change that?
    - Do I have a choice other than to turn off rp_filter?


    Claus Fischer <>
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