Date: Tue, 30 May 2006 10:38:17 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-current@FreeBSD.org, Goran Gajic <ggajic@afrodita.rcub.bg.ac.yu> Subject: Re: question regarding tap/tun devices Message-ID: <20060530173817.GB6706@odin.ac.hmc.edu> In-Reply-To: <20060530094715.L79162@fledge.watson.org> References: <Pine.LNX.4.63.0605282032240.10175@afrodita.rcub.bg.ac.yu> <20060530013856.GA26022@odin.ac.hmc.edu> <20060530094715.L79162@fledge.watson.org>
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On Tue, May 30, 2006 at 09:49:01AM +0100, Robert Watson wrote:
>=20
> On Mon, 29 May 2006, Brooks Davis wrote:
>=20
> >On Sun, May 28, 2006 at 08:33:32PM +0200, Goran Gajic wrote:
> >>I'm running 7.0-CURRENT build Thu May 25 23:17:10 CEST 2006 GENERIC=20
> >>config.
> >>While playing with dynamips emulator which uses tap I've noticed that
> >>ifconifg tun0 create or ifconfig tap0 create doesn't work (this doesn't
> >>have anything to do with emulator which works great).
> >
> >These interfaces don't use the network interface cloning interface and=
=20
> >thus can not be created with ifconfig. This should be fixed, but the /d=
ev=20
> >based cloning hackes they use make this difficult.
>=20
> I've never quite understood if this is a problem or a benefit. =20
> Devfs-cloning of tap and tun are very convenient from an application writ=
er=20
> perspective -- you just open /dev/tap or /dev/tun, and magic happens. Wi=
th=20
> our current ifnet cloning interface, is it possible to say "atomically=20
> create and return the next available interface number"?
If you don't provide a unit number (i.e. "ifconfig gif create") you
get the next available one and ifconfig outputs it on stdout (unless
you rename it in the same command). I think we'll need to support
/dev/{tap,tun} style cloning in the future (there's way too much code
that depends on it), but I think we also should support ifconfig cloning
as well. The two main reasons I see for doing so are that users now
expect it and that is provides a way to remove the interfaces.
-- Brooks
--=20
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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