Quote:> Winsock has two ways of doing multicast:
> The berkley socket style... and the WSA style.
> The document at this link describes the two api's
> http://www.ipmulticast.com/community/whitepapers/ipmcapps.html
> I tried the berkley socket style with winsock ( UDP Multicast Test )
> As some might have seen... I did NOT work that very well :)
> Now I am wondering:
> Is this because the network architecture does not support it ?
> Or could the WSA stuff make a difference ?
I've not had any trouble with my own multicast tests using the BSD style of
calls. Your problem is almost certainly to do with the network provider.
Check with them to find out whether they route multicast packets or not.
Ask them which version of IGMP their routers are set up to support. If they
don't know, then they're also not able to answer correctly that they route
multicast packets. [Some ISPs have been known to say "yes" just to get the
customer off the phone, and assuming that the customer is asking about
normal IP traffic]
Set up your own network, so that you can do some network monitoring to see
the packets on their way around - your ISP will almost certainly _not_ let
you monitor their network. Watch your packets making their way around your
network, and you will assure yourself that the multicast code works.
Alun.
~~~~
[Note that answers to questions in newsgroups are not generally
invitations to contact me personally for help in the future.]
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