Re: Dummy Network Interface
From: Julian Elischer (julian_at_elischer.org)
Date: 01/15/04
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Date: Thu, 15 Jan 2004 11:11:41 -0800 (PST) To: Vlad Galu <dudu@diaspar.rdsnet.ro>
On Thu, 15 Jan 2004, Vlad Galu wrote:
> Robert Watson <rwatson@freebsd.org> writes:
>
> |
> |On Tue, 13 Jan 2004 ms419@freezone.co.uk wrote:
> |
> |> How does one create a dummy network interface in FreeBSD?
> |
> |Dummy in what sense? An interface where the packets are simply
> |dropped? if_tap and if_tun both provide pseudo-device in /dev that a
> |userspace process can attach to in order to emulate a network interface
> |(used by VMWare, ppp, various tunneling bits, ...) In the absense of a
> |process sitting on the device, they simply drop the packets. Although
> |they may get garbage-collected if unused on -CURRENT... You can also
> |use netgraph to bring pseudo-interfaces, perhaps without anywhere for
> |packets to go.
> |
> |And, I suppose, create in what sense? Are you looking at this from a
> |developer perspective, or you just need one from a user perspective.
> |If writing a device driver (and hence needing a starting point), if_tap
> |and if_tun are fairly decent models for a pseudo-interface.
>
> I think he could use the discard interface smoothly. On Linux (from
> which the dummy interface notion is taken from) it is simply used for
> testing purposes, as in routing, or perhaps socket programming. I
> personally have used it for a while, but then I used interface aliasing,
> which became a habit.
ng_iface <-> ng_hole
would yield a 'black hole' interface if that is what is being looked
for..
ng_iface is similar to both tun and tap exceot that it can route the
packets to arbitrary netgraph moudles or to any subsystem to which
netgraph has a supported interface. (e.g. userland or a tty)
>
> |
> |Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
> |robert@fledge.watson.org Senior Research Scientist, McAfee
> |Research
> |
> |
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> |
>
>
> ----
> If it's there, and you can see it, it's real.
> If it's not there, and you can see it, it's virtual.
> If it's there, and you can't see it, it's transparent.
> If it's not there, and you can't see it, you erased it.
>
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