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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
    ...
    10.36.1.12 0.0.0.0 255.255.255.255 UH 0 0 0 cipcb3
    10.36.1.11 0.0.0.0 255.255.255.255 UH 0 0 0 cipcb1
    10.36.0.0 10.36.1.12 255.255.0.0 UG 0 0 0 cipcb3
    10.36.0.0 10.36.1.11 255.255.0.0 UG 0 0 0 cipcb1
    ...


    Now when a packet comes in from 10.36.2.2 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

    --
    Claus Fischer <claus.fischer@clausfischer.com>
    http://www.clausfischer.com/
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