Removal of deprecation for network_interfaces != AUTO

[Sam Leffler]

Brooks Davis wrote:
> On Tue, Jun 02, 2009 at 06:33:15AM +0100, Matthew Seaman wrote:
>   
>> Brooks Davis wrote:
>>
>>     
>>> I've never seen a valid use case, just failures to understand the
>>> current system.
>>>       
>> My laptop has iwi0 and bge0 interfaces.  At work, both of these obtain
>> addresses and default routes by DHCP, but from two completely different DHCP
>> servers.  When I'm plugged into the wired network I want the bge0 interface to
>> be the default route, but iwi0 comes first in the list of interfaces produced
>> by ifconfig, so it gets configured first and sets the route.  Of course, when
>> I'm not plugged into the wired network I want iwi0 to have the default route,
>> so I can't just use dhclient.conf to disregard routing information on that
>> interface.
>>
>> All in all, setting network_interfaces="bge0 iwi0 lo0" does exactly what I
>> want with minimal effort.
>>     
>
> This is an interesting use case.  This is certainly the easiest way
> to do this in 7.  FYI, it won't work by default in 8.0 because we
> only run dhclient from devd so there is no ordering unless you set
> synchronous_dhclient="YES".  What I've been thinking here is that we
> should have a way to tell dhclient which interface(s) to prefer for a
> default route.  I've been meaning to fix that for a while, but since
> I've been using a cardbus wireless device, I've not needed to scratch
> that itch.
>   
Some people prefer to use lagg's failover handling to handle the 
wired-wireless switchover.

    Sam