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Date: Tue, 10 Apr 2007 06:26:30 +0100
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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Subject: Re: recent CURRENT seems to affect if_tap, if_bridge with qemu
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Scott Robbins wrote:
> To follow up, the problem seems to be solved.  In private email, someone
> suggested to me that I ensure that both bridge0 and tap0 were up.  Prior
> to my latest update of CURRENT, my /etc/qemu-ifup script just had 
>
> /sbin/ifconfig ${1}
>
> Changing it to 
>
> /sbin/ifconfig ${1} up
>
> fixed the problem. 
>   

There is a net.link.tap.up_on_open sysctl which may help; it will mark a 
tap instance as IFF_UP immediately on devfs open or ifconfig clone.

Regards,
BMS