dhcpcd-discuss

Re: Multi-homed default route trouble with AutoIP

Mike Crowe

Thu Jul 09 13:57:47 2020

On Wednesday 08 July 2020 at 12:38:34 +0100, Roy Marples wrote:
> On 08/07/2020 12:04, Roy Marples wrote:
> > This is dhcpcd's fault.
> > I've just added a patch to bump the route metric up for IPv4LL routes
> > and ensure it's evaluated last on other OS's.
> > 
> > https://roy.marples.name/cgit/dhcpcd.git/commit/?id=b7ede4d38fab12fd093dcb51416d83764de1557e
> 
> This one also:
> https://roy.marples.name/cgit/dhcpcd.git/commit/?id=3c0123be03d7315a3b35bc0fb90b6d3463393bcd
> 
> And I tested with this patch on Linux .... seems to work fine.

Thanks. That seems to solve the problem. I'm not really sure why it's worth
adding a default route for interfaces with only a link-local address. The
only reason I could come up with was that it allows communication with
devices on the same link that have non-link-local addresses, but only if
those hosts will also know to route their replies to link-local addresses
back to the right interface. Is there another reason?

> Are you running dhcpcd separately per interface?

Separately for each interface since I need to cope with interfaces coming
and going.

> As you should not see that with one dhcpcd instance with the released
> versions.

I shall investigate whether it would be possible to run only a single
instance.

Thanks for the speedy response and fix.

Mike.

Follow-Ups:
Re: Multi-homed default route trouble with AutoIPRoy Marples
References:
Multi-homed default route trouble with AutoIPMike Crowe
Re: Multi-homed default route trouble with AutoIPRoy Marples
Re: Multi-homed default route trouble with AutoIPRoy Marples
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