Switching from wired to wireless getting "network down"

[Sam Leffler]

Andrew Thompson wrote:
> 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.
>   

I believe LINK_UP should be sufficient but we need to check.

    Sam