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Subject: Re: Multicast Driver Testing Quick How-To v 0.3 [was: Re: List of
	pending v2.4 kernel bugs]
From: David Dillow <dave@thedillows.org>
To: Roger Luethi <rl@hellgate.ch>
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       Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
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Date: 09 Aug 2004 23:48:52 -0400
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On Thu, 2004-08-05 at 09:33, Roger Luethi wrote:

> We haven't joined the next group yet, so there should be no answer:
> 
> tester# ping -r -I eth0 -t 1 -c 2 224.1.1.37
> 
> Use packet sniffer to confirm that target is not seeing the request
> (use -p option for tcpdump or tethereal to prevent promiscuous mode)
> 
> Now join the group (Ethernet level):
> 
> target# ip maddr add 01:00:5e:01:01:25 dev eth0
> 
> tester# ping -r -I eth0 -t 1 -c 2 224.1.1.37
> 
> Use packet sniffer to confirm that target is seeing the request now.

Some versions of tcpdump/libpcap will enable all-multicast mode
regardless of options given and user. This bit me on RedHat 9 using
libpcap 0.7.2 and tcpdump 3.7.2 while testing the typhoon driver.

Dave