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 _______________________________________________ Udpcast mailing list Udpcast(a)udpcast.linux.lu https://lll.lgl.lu/mailman/listinfo/udpcast