ifconfig -- how to remove address and mask?

[freebsd at dreamchaser.org]

I tried delete, but it only works for *additional* ip addresses added using 
the alias command, not the original, primary one.  I can't remember the 
error message.

Yuri Pankov wrote:
> On Sun, 2007-10-28 at 21:14 -0700, freebsd at dreamchaser.org wrote:
>> running 6.1,
>>
>> Is there a way to bring an interface down and remove the ipaddr and mask?
>> I've tried ifconfig destroy with no effect, and I'm getting tired of
>> twiddling rc.conf and rebooting...
>>
>> The problem arises when testing a new configuration where an existing
>> interface has an assigned ip addr, and is then changed to be used with
>> pppoe.  The routine tables get really confused...
...
> Try  ifconfig <interface> delete.