Am 28.05.2015 um 05:29 schrieb Julian Elischer:
Julian, I am guessing (with no actual information) that something in gre
processing is
assuming that the packet id going where it normally would go. (and not
where fwd is sending it).
you really need to use objdump or gdb to look at the gre module and
work out where
gre_output+0x467
is in the function. that should give you a clue on the problem.
not too helpful I know... but you have a reproducible case at least.
kgdb may be your friend if you
have a serial cable or firewire cable.
It is a multihomed machine behind two DSL routers. All packets leave the
interface with the default route unless I use IPFW with fwd.
Is there another way to force packets to leave the correct interface?
The problem does also appear if I shutdown the second WAN interface.
This is the way the traffic goes:
re0 (internal network) -> fwd to gre1 -> fwd to gateway of re1 -> re1
If the traffic source is the machine an not the internal network it
seems to cause no problems. I guess the problem is to use fwd twice.
I will do additional tests and I will try to debug this using a serial
connection next week.
kind regards,
Julian
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