Re: [BUG?] unwanted proxy arp in 2.4.19-pre10

From: Bill Davidsen (davidsen@tmr.com)
Date: Tue Jul 23 2002 - 17:06:58 EST


On Sun, 14 Jul 2002, Julian Anastasov wrote:

> Start with fixing your picture (all hubs and wires, please).
> Linux ARP never sends 1 broadcasts through 2 devices, so it seems there is
> a hub near Node_A (or Node_A is running bridging), I can't believe 230.1
> and 230.4 are directly connected with cross cable. Make sure you have
> the needed host/subnet routes for each interface. Also, make
> sure tcpdump really shows the ARP replies, make the tests with
> arp -d IP ; ping -c 1 IP

The tests were made with a copy of tcpdump on every NIC of every machine
involved, with a hardware sniffer on each of the NICs. It was analyzed by
ISP network gurus, and it appears that it really does happen, and both
D-Link and Cisco switches don't like it when it does.

The problem was solved by substituting a more capable node.

Since I'm told by network people that current behaviour is the desired
behaviour, by definition there is no bug. By a mixture of diddling flags
in /proc/sys and hand routing every address through the desired NIC you
can make it work, so "no problem."

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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