Re: Multicast Driver Testing Quick How-To v 0.3 [was: Re: List ofpending v2.4 kernel bugs]

[David Dillow]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/