The ability for the STB to change or not change channels is key to understanding where the problem might lie.
When you make a channel change request on the STB a series of actions take place in the background relating to multicast streams and IGMP Leave / Join requests to the upstream devices from your STB. For example the RG and the VRAD both act as IGMP Proxys and if you look in the RG logs you can see examples of IGMP Leave / Join request to multicast streams.
Here is a key page with a filter that should show you some of the IGMP traffic:
»
192.168.1.254/xslt?PAGE= ··· ILY=igmpINF 2010-02-18T21:02:00-05:00 igmp: bridge1: IGMP proxy leaving group 239.193.102.28
INF 2010-02-18T23:02:00-05:00 igmp: bridge0: querier group 239.192.1.134 host 192.168.2.100 left, EXCLUDE mode, ver 3, 0 sources
INF 2010-02-18T23:02:00-05:00 igmp: bridge1: IGMP proxy leaving group 239.192.1.134
INF 2010-02-18T23:57:39-05:00 igmp: bridge0: querier group 239.255.255.250 host 192.168.2.114 joined, EXCLUDE mode, ver 3, 0 sources
In my sample log above, my DVR is at 192.168.2.100
Dave