Debugging an ARP issue (no resp to ARP requests)
mandeepsandhu.chd at gmail.com
Tue Jan 20 16:34:57 EST 2015
> This won't work. Linux will consider both addresses as local to the
> host and will never respond to arp requests from any of those addresses.
> See http://en.wikipedia.org/wiki/Host_model
According to this Linux defaults to the 'weak host' model (I don't
know if Ubuntu changes this default). Although I don't know why this
will matter because I'm sending packets destined for the IP of that
specific interface (which should work in strong and weak models).
I think I'll sift through the ARP processing code to see if there are
points where it can drop a packet.
> You might be able to change this by tuning arp_announce/arp_ignore - But
> I don't know if that changes the behaviour wrt responses to local
> addresses... See
> https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt for
> the meaning of these knobs.
I'm playing around with different combinations of anything even
remotely connected to ARP and routing. Nothing's changed till now.
Thanks for your time.
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