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SubjectRe: [2.4 PATCH] bugfix: ARP respond on all devices
On Wed, 20 Aug 2003, David S. Miller wrote:

> On Wed, 20 Aug 2003 12:49:14 -0400 (EDT)
> Bill Davidsen <> wrote:
> > On 19 Aug 2003, Daniel Gryniewicz wrote:
> >
> > I have been asking for a similar thing as well, David mentioned some
> > things that would break, but I believe they break if you use source
> > routing, so that seems not to be a real objection.
> It's not about source routing. It's about failover and being
> able to use ARP on interfaces which don't have addresses assigned
> to them yet.

David mentioned that you could solve the problem by using *rp_filter and
source routing. I don't think that's entirely true, but doing so has the
same drawbacks and breaks the same things as a flag to make Linux behave
like Sun/BSD/Windows (and work with Cisco is the cases previously

> > I find it interesting that we can't change networking because a few
> > complex systems would have to be reconfigured, but we *can* change modules
> > which requires config changes on probably 90% of all systems (commercial
> > distributions).
> Decisions about Networking will always be in a different domain
> because the way one behaves has effects upon other systems not
> just the local one.

Yes, that's exactly the point, the way Linux works has bad effects on
certain other machines, as in leaves them disconnected to the Linux

> BTW, another thing which makes the source address selection for
> outgoing ARPs a real touchy area is the following. Some weird
> configurations actually respond with different ARP answers based upon
> the source address in the ARP request. You can ask Julian Anastasov
> about such (arguably pathological) setups.

I don't think anyone is asking for a change in the default behaviour
(although my point about breaking modules does apply), people would be
satisfied, even ecstatic, if we had a simple way (flag) to set to make
Linux work without setting /proc filters, using arpfilter, applying source
routes (David's suggestion) and generally jumping through hoops.

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

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