Re: iperf with multicasting

[Jon Zeeff <jzeeff --at-- internet2.edu>]

You don't need IGMP at all to send multicast traffic - just send it.

You will need something to signal that you want to receive it (eg, IGMP).

Windows XP will support IGMPv2 and v3 in a compatible way.  Most interest 
in v3 seems to come from the desire for SSM (source specific 
multicast).  Not sure
if iperf supports SSM.  It's a simple change and it would be nice.



At 10:53 AM 9/30/2003 -0400, Matthew J Zekauskas wrote:
>--On Tuesday, September 30, 2003 5:21 PM +0300 Steven Mugassa 
><steven.mugassa --at-- intafrica.com> wrote:
>
>>My question is, which multicast system is used by iperf when sending its UDP
>>multicast packets? Is it GRMP or IGMP? or another protocol different from
>>those two?
>
>Its your OS, not Iperf, that will decide this.  My bet would
>be on some flavor of IGMP (note that there are two different,
>and I don't believe compatible, versions deployed right now
>(v2 and v3)).  So, I would start with OS documentation/references...
>
>--Matt, not a multicast expert, knows just enough to be dangerous