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
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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Tom Carpenter