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From: Alexey Karguine <alexey.karguine@gmail.com>
To: freebsd@dreamchaser.org
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Subject: Re: ifconfig -- how to remove address and mask?
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On 29.10.2007, at 7:14, freebsd@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...

You can use something like that:

	ifconfig fxp0 inet 10.10.10.1/24 -alias

It will remove address 10.10.10.1/24 from interface fxp0.