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Date:      Wed, 05 Aug 1998 14:24:20 -0700
From:      Mike Smith <mike@smith.net.au>
To:        Denis DeLaRoca <denis@acacia.cts.ucla.edu>
Cc:        Mike Smith <mike@smith.net.au>, Joao Carlos Mendes Luis <jonny@jonny.eng.br>, hardware@FreeBSD.ORG, network@FreeBSD.ORG
Subject:   Re: Which PCMCIA Ethernet for FreeBSD ? 
Message-ID:  <199808052124.OAA01134@dingo.cdrom.com>
In-Reply-To: Your message of "Wed, 05 Aug 1998 12:53:02 PDT." <Pine.BSF.3.96.980805125157.3935A-100000@acacia.cts.ucla.edu> 

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> 
> On Wed, 5 Aug 1998, Mike Smith wrote:
> 
> > > I've heard that 3Com cards do not support promiscuous mode, is this
> > > true ?  Which cards do you suggest for this kind of application ?
> > 
> > 3com cards support promiscous mode OK, it's multicast that they handle 
> > badly.
> 
> Could you amplify on the bit about multicasting?

Most 3com cards don't have a programmable multicast filter, so to 
handle multicast you have to put them into promiscuous mode and then 
do the filtering manually (ie. more software overhead).

The new 3c905B does have a real multicast filter, and some of their 
older hardware (eg. 3c503, 3c505) might have done OK, but the '509 and 
'589 certainly don't.

-- 
\\  Sometimes you're ahead,       \\  Mike Smith
\\  sometimes you're behind.      \\  mike@smith.net.au
\\  The race is long, and in the  \\  msmith@freebsd.org
\\  end it's only with yourself.  \\  msmith@cdrom.com



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