Dummy Network Interface
rwatson at freebsd.org
Wed Jan 14 19:14:01 PST 2004
On Tue, 13 Jan 2004 ms419 at 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.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org Senior Research Scientist, McAfee Research
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