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Date: Thu, 21 May 2009 00:37:03 +0100
From: Bruce Simpson <bms@incunabulum.net>
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To: Asheesh Jadav <ajadav@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: Deleting a TAP interface
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Asheesh Jadav wrote:
> Hi,
>
>   I'm able to create the TAP interface, lets say with name 'test', and bring
> it up, but when I try deleting it using
>
> ioctl(fd, TUNSETPERSIST, 0)
>   

It sounds from your interface name as though you are using a Linux 
system, and I can't find this ioctl documented anywhere on FreeBSD:
%%%
tack:/usr/src/sys/net % grep -Hr TUNSETPERSIST .
Exit 1
tack:/usr/src/sys/compat % grep -Hr TUNSETPERSIST .
Exit 1
%%%

Perhaps try a Linux development forum who will be better able to assist 
you? In FreeBSD, tap/tun interfaces are cloners, and can be 
created/destroyed using the usual cloneable interface mechanisms.

thanks,
BMS