[Udpcast] ATI AT-8024 does not register udpcast multicast group

[Tom Carpenter]

I did a little more testing related to this issue I raised.
With our network monitoring laptop connected to the port
to which traffic is mirrored from the test multicast server,
I captured traffic with both Ghost and UDP Cast as the multicast
server. Shortly after Ghost starts, it sends two packets
identified as "IGMP Membership Report" to the address 224.77.0.0;
UDP Cast does not produce any traffic identified in that way.
In one instance I tried starting UDP Cast using the switches
"--mcast-all-addr 224.77.0.0"; another time I tried using
"--nopointopoint" on the server and connecting with two UDP
Cast receivers.


-Tom Carpenter

Tom Carpenter wrote:
> I manage a lab of PCs running Windows XP Pro. All of the
> PCs are connected to an Allied Telesyn AT-8024 (firmware
> v3.3.1); IGMP snooping is enabled. To clone the systems
> in the lab I set up one PC then booted that PC from a
> floppy with the DOS version of Ghost server; similarly
> the systems to be cloned are booted from floppies with
> the Ghost client. (It's more automated than that, but that's
> the general scheme. FYI the version of Ghost is 7.5). I can
> see the server and clients join and leave multicast groups
> when logged into the AT-8024 and issuing the appropriate
> commands on the switch. If I substitute udpcast for Ghost,
> the switch never registers that either the server or the
> clients have joined a multicast group; messages on the
> udpcast server and clients indicate otherwise. If I then
> tell the server to send an image to the clients the network
> is flooded; this doesn't happen when using Ghost. I realize
> it's time to roll up my sleeves, break out our network
> monitoring laptop, and get to work...just thought I'd ask
> if anyone else has run into this or might have some
> suggestions.
> 
> Thanks in advance,
> 
> Tom Carpenter
> 
> P.S.
> 
> Don't know if this info is helpful, but when I start up the
> Ghost server the switch indicates the following:
> 
> Multicast Group   Member Port   VLAN     Host IP
> ---------------   -----------   ----     -------
> 
> 01:00:5e:4d:00:00     21          1      172.30.22.120
> 
> 
> When the first Ghost client is started, that information disappears
> and the following is displayed:
> 
> 
> Multicast Group   Member Port   VLAN   Host IP
> ---------------   -----------   ----   -------
> 
> 01:00:5e:4d:00:00     19          1    172.30.22.119   Left the group
> 
> 01:00:5e:4d:13:5e     19          1    172.30.22.119
> 
> 
> Upon starting the second Ghost client the switch displays the
> following:
> 
> 
> Multicast Group   Member Port   VLAN   Host IP
> ---------------   -----------   ----   -------
> 
> 01:00:5e:4d:13:5e     19          1    172.30.22.119
> 
>                       20          1    172.30.22.118
> 
> 
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