All things related to multicast

[Alan Crosswell <>]

The stats from routers will miss all but the first joiner on a subnet  
with IGMPv2. In the case of, for example, a dorm this could  
significantly undercount.

I believe that IGMPv3 will track all the members. If you are able to  
run v3 (modern IGMPv3 snooping switches) then you might as well use  
SSM too:-)
/a

On Jan 20, 2009, at 8:20 AM, "Julian Y. Koh"  
<> wrote:

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> At 19:08 -0500 1/19/2009, Richard Mavrogeanes wrote:
> > I think the most reliable (and certainly the easiest) way to count  
> > viewers
> > is to embed the view in a web page and count web hits. This can be a
> > sophisticated or simple as you wish.
>
> That only gives you the number of hosts that loaded the web page.   
> What the
> described stats give you is the number of computers that are  
> actually tuned
> in and receiving the content.
>
>
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> --
> Julian Y. Koh                          
> <mailto:>
> Network Engineer                                   <phone: 
> 847-467-5780>
> Telecommunications and Network Services         Northwestern  
> University
> PGP Public Key:<http://bt.ittns.northwestern.edu/julian/ 
> pgppubkey.html>