Re: Problem with proxy arp in debian sarge kernel 2.6.x

[Conny Brunnkvist <conny@fuchsia.se>]

Erik Persson skrev:
> I've solved the problem.

Good for you :-)


> I'm still interested in ways to get linux to answer and listen to
> ip-addresses other than the ones it has configured interfaces for.

Sounds like it is reverse path filtering that troubles you. It too can
be controlled per configured interface using sysctl settings:
/proc/sys/net/ipv4/conf/*/rp_filter

There's also the "log_martians" flag which has proven useful for
troubleshooting.

Links:
http://lartc.org/howto/lartc.kernel.html#LARTC.KERNEL.RPF
and
http://lxr.linux.no/source/Documentation/networking/ip-sysctl.txt?v=2.6.11#L536
etc...

I was in the belief of that the default behaviour changed somewhere
after Linux 2.0.x and that the defaults in 2.4.x and 2.6.x are equal.

Perhaps instead it is the Debian-specific default setting
(/etc/network/options and /etc/init.d/networking) that changed between
Woody and Sarge? :-)

//conny