Re: Dummy Network Interface

From: Robert Watson (rwatson_at_freebsd.org)
Date: 01/15/04

  • Next message: Vlad Galu: "Re: Dummy Network Interface" 
    Date: Wed, 14 Jan 2004 22:12:16 -0500 (EST)
To: ms419@freezone.co.uk

    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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  • Next message: Vlad Galu: "Re: Dummy Network Interface"

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