Switching from wired to wireless getting "network down"

[Sam Leffler]

J. Porter Clark wrote:
>>> Date: Fri, 27 Mar 2009 10:04:29 -0700
>>> From: Jason Nordwick <jnordwick at gmail.com>
>>> Sender: owner-freebsd-mobile at freebsd.org
>>>
>>> This appears to be the case. "route get 192.168.1.1" (my netgear wireless)
>>> shows that it still wants to use bfe0 instead of the wpi0 interface. How do
>>> I get it so that when I unplug my cable and my wireless is up, it changes
>>> the routing table?
>>>
>>> -j
>>>
>>>
>>> On Fri, Mar 27, 2009 at 9:31 AM, Jason Nordwick <jnordwick at gmail.com> wrote:
>>>
>>>       
>>>> I just updated to the current -STABLE (7.2-PRERELEASE is the same thing?
>>>> hopefully).
>>>>
>>>> When I boot with the network cable plugged in, but then try to unplug it
>>>> and up my wireless, it doesn't seem to work although the ifconfig shows I am
>>>> joined to my wireless network. Is there some magic I need to do to reset the
>>>> routing tables or something?
>>>>         
>
>   
>> Depends on your configuration. Do you use DHCP or static network
>> configurations? If it is DHCP, I suspect /etc/rc.d/dhclient restart
>> would do the trick. If it is status:
>> route add default abc.def.gh.ij
>> should do the trick. 
>>     
>
>   
>> Going the other way can be a tiny bit more involved. 'ifconfig wlan0
>> down' first or 'route delete default' to get rid of the current
>> static. (Note: wlan0 on stable needs to be replaced with the name of
>> your wireless interface.)
>>     
>
> I've been playing around with this sort of setup, too, where I
> want a command line to change from wired to wireless (at the
> same IP address, even) and back again.  I haven't found the
> magic solution, particularly one that doesn't have a lot of
> hardcoded network config in it.  I'm also somewhat ticked that
> "route flush" doesn't really flush all routes like the man page
> says.  8-) Eventually, I usually arrive at a point where I can't
> find my way back and have to reboot to get some work done.
>
> Some things I've been using are "route delete <my ip address>"
> and "route add -ifp <interface> default".  Might be a good idea
> to "arp -a -d", too.
>
>   
If this is 7.x or later, have you tried using lagg(4) to do automatic 
failover?  The man page says wpa doesn't work but after talking to 
Andrew we think that's no longer true.  I haven't had a chance to try it 
myself.

    Sam