Switching from wired to wireless getting "network down"

[Andrew Thompson]

On Sat, Mar 28, 2009 at 09:35:46AM -0700, Sam Leffler wrote:
> J. Porter Clark wrote:
>>   
>>> 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.

This is becuase lagg(4) will set the interface down/up when grabbing it
and wpa_supplicant does not get restarted. This may work now but looking
through /etc/devd.conf I dont see a rule to handle it (only ATTACH and
LINK_UP events). A new devd event may need to be added to handle this
situation. Patches welcome.


Andrew