Re: RFC: ethernet links should remember routes the same as addresses

[Christopher Friesen]

Andi Kleen wrote:
> 
> "Christopher Friesen" <[e-mail]> writes:
> > Currently, if I run "ip link set dev ethX down", all routes associated with that
> > IP address in the additional routing tables are lost.  This is somewhat
> > understandable, as the addresses are not actually available anymore.  However,
> > the addresses are still visible associated with the link.  Then I run "ip link
> > set dev ethX up".  The route in the main routing table comes back, but none of
> > the other routes do.  Somehow, all of those additional routes must be re-added.
> 
> ip route list dev device > BACKUP
> 
> ...
> 
> while read i ; do ip route add $i ; done < BACKUP

Unfortunately, this seems to only list the routes in the main routing table, and
these routes are recreated automatically when I bring the link back up.

The problem is that I have routes in multiple other routing tables, and they
don't show up in this command.  I assume I'd have to run a similar command for
each routing table, which is kind of a pain.

If the driver re-init is totally separate from the routing code, is there any
real reason why shutting down the driver *should* remove all routes to that
device?  Maybe the simplest solution would be a new ioctl that would be a link
*reset*...just down/up the link without affecting anything else....

-- 
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