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From: Archie Cobbs <archie@whistle.com>
Message-Id: <200008242140.OAA02091@bubba.whistle.com>
Subject: "poor man's bridging"
To: freebsd-net@freebsd.org
Date: Thu, 24 Aug 2000 14:40:11 -0700 (PDT)
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On the topic of bridging..

Today I realized today that you can do "poor man's bridging"
between two interfaces very easily, without even having
"options BRIDGE" in your kernel config!

Just use something like this script..

    #!/bin/sh

    # Replace with your interface names
    IF1="de0"
    IF2="de1"

    kldstat -v | grep -wq ng_ether || kldload ng_ether
    ngctl connect ${IF1}: ${IF2}: lower lower
    ngctl msg ${IF1}: setautosrc 0
    ngctl msg ${IF2}: setautosrc 0
    ngctl msg ${IF1}: setpromisc 1
    ngctl msg ${IF2}: setpromisc 1
    ifconfig ${IF1} up
    ifconfig ${IF2} up

Just make sure you don't physically connect the two ports, or you'll
get one heck of a packet storm (that's why this is "poor man's bridging"
-- no loop detection or intelligent bridging).

By inserting a ng_tee(4) node, you could have it so the local machine
is able to talk as well (exercise left to the reader :-)

-Archie

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com


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