lkml.org 
[lkml]   [2002]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:25    [from the cache]
©2003-2011 Jasper Spaans