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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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