Date: Wed, 14 Jan 2004 22:12:16 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: ms419@freezone.co.uk Cc: freebsd-net@freebsd.org Subject: Re: Dummy Network Interface Message-ID: <Pine.NEB.3.96L.1040114220930.55901A-100000@fledge.watson.org> In-Reply-To: <173CC3C8-45A5-11D8-B102-000A95C71776@freezone.co.uk>
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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. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Senior Research Scientist, McAfee Research
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