Date: Sat, 06 Oct 2007 01:14:54 -0600 From: freebsd@dreamchaser.org To: Christopher Cowart <ccowart@rescomp.berkeley.edu>, bc979@lafn.org Cc: freebsd-questions@freebsd.org Subject: Re: tcpdump -- non-local traffic not showing Message-ID: <470735EE.7050909@dreamchaser.org> In-Reply-To: <20071006001209.GJ19429@hal.rescomp.berkeley.edu> References: <4706C94D.4030206@dreamchaser.org> <20071006001209.GJ19429@hal.rescomp.berkeley.edu>
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Many thanks; that solved the problem.
Gary
> You're probably plugged into a switch ("learning bridge"). Switches
> partition your collision domain -- they learn which MAC is available on
> which port and only send on that port.
>
> You either need a hub or a really expensive switch (the kind that you
> log in to and set up port mirrors).
..
> What is your LAN? My guess is that its a router or a switch. In either
> case, the router/switch is not forwarding the packets to all the ports.
> It retains a table of MAC addresses and the ports they are on. It only
> forwards packets to the desired port. A computer on a different port
> will not see any of those packets. You have to use a hub or just a
> non-learning bridge to get the packets forwarded to all ports. Those
> are really hard to find anymore.
>
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