All things related to multicast

[Toerless Eckert <>]

On Fri, Jun 14, 2002 at 02:26:55PM -0700, Hans Kuhn wrote:
> Why yes. I have cisco a 7200 with igmpv3, and an HP switch
> with snooping between the XP host and the cisco 7200.

You sure that HP switch supports IGMPv3 ? If it does not then it would
simply flood unrecognized IGMP messages (like the IGMPv3 membership 
reports) but because it doesn't recognize them, it wouldn't establish
forwarding, so even though everything looks correct on router and host,
the switch would block the traffic.

If in doubt, simply switch off IGMP Snooping. It's not as if the little
bit of multicast would hurt any current PC - it's really only an issue
if you still have 10Mbps segments or really old hosts.

Cheers
        Toerless

> -- 
> Hans Kuhn, Academic User Services          office (541) 346-1714
> University of Oregon, 237 CC               fax    (541) 346-4397
> 
> Key fingerprint =  1E BC 32 03 AC E9 82 6C  44 4A CD 63 BB 2D 51 89
> 
> On Fri, 14 Jun 2002, Toerless Eckert wrote:
> 
> :    Hans, do you by any chance have IGMPv3 enabled on your routers
> :    ("ip igmp version 3" if running a Cisco ), but also have some
> :    IGMP Snooping or CGMP switched between the router and you ?
> :    
> :    Cheers
> :     Toerless
> :    
> :    On Fri, Jun 14, 2002 at 11:50:09AM -0700, Hans Kuhn wrote:
> :    > 
> :    > Is anyone out there having problems with multicast
> :    > applications running under Windows XP pro? At first when I
> :    > started working with XP, I thought the applications were to
> :    > blame, but after visiting Marshall's multicast tester and
> :    > discovering that I was told I'm not multicast-enabled, 
> :    > 
> :    > At this point I am pretty sure XP is the problem. I know of
> :    > people on my campus who are successfully using IP/TV 3.4beta
> :    > with XP, but both machines I've installed XP on don't
> :    > work. This would point to a network configuration issue, but
> :    > I haven't the foggiest what might be wrong. I have tried
> :    > enabling and disabling the built-in firewall and the QOS
> :    > shim, but neither affects the problem. Ideas?
> :    > 
> :    > Hans
> :    > 
> :    > -- 
> :    > Hans Kuhn, Academic User Services           office (541) 346-1714
> :    > University of Oregon, 237 CC                fax    (541) 346-4397
> :    > 
> :    > Key fingerprint =  1E BC 32 03 AC E9 82 6C  44 4A CD 63 BB 2D 51 89
> :