When attempting to multicast to Dell OptiPlex 790 workstations, the client disconnects less than a second after it finds the master, with the error message "Could not get local MAC address". A 790 can be a master, but not a client. ifconfig on a 790 yields this:
em1 Link encap:Ethernet HWaddr 78:2B:CB:A1:66:24
inet addr:10.1.113.87 Bcast:10.1.115.255 Mask:255.255.252.0
inet6 addr: fe80::7a2b:cbff:fea1:6624/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:40638 errors:0 dropped:52 overruns:0 frame:0
TX packets:35980 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:20618027 (19.6 Mb) TX bytes:2304047 (2.1 Mb)
Interrupt:20 Memory:e1a00000-e1a20000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Has anyone else seen this problem? Is there a solution?