Re: Two interfaces sharing the same IP address: how to change default route's interface on link change?

Hi,

On Wed, Feb 20, 2008 at 01:18:03AM +0000, Bruce M. Simpson wrote:
Jeremie Le Hen wrote:
In summary, favor wired connectivity over the wireless one, at any time:
could this be at boot time or not.

I'm pretty sure I'm not the only one who wants this kind of setup. So
how did you achieve this setup?

The forwarding code needs to be changed to support the notion of a floating
static, regardless.

Recall that in BSD default routes configured statically, whether manually or
by DHCP, have the RTF_STATIC flg set.

Currently, the BSD behaviour is NOT to update the rt_ifp for an RTF_STATUC
route when ifadown is called. I believe this to be correct and honours the
original API contract of RTF_STATIC. It is not what you desire in your use
case however.

Configuring ifstated to manually replumb addresses and routes is probably an
easier place to start. Seamless migration is not possible yet; generally
sockets are tied to the interface where they were implicitly bound, also
nexthop selection happens purely on the basis of destination address.

Thank you for your explanation. Even though it is quite clear to me, I
think re-architecturing the routing code is out of my knowledge.

FWIW, I've just set the the workaround suggested by Niki Denev in the
other reply, which uses lagg(4) with the failover protocol, and it works
pretty well.

Thank you.
Best regards,
--
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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