Re: UDP and OT (email@hidden)
Re: UDP and OT (email@hidden)
- Subject: Re: UDP and OT (email@hidden)
- From: Mark Hunt <email@hidden>
- Date: Sat, 14 Dec 2002 10:01:44 +0000
Mark
I've recently been through exactly the same thing with IP Multicasting.
MulticastGroupAddress isn't very clear as what you should use here, as I
found some text which says :-
<snip>
Multicast address are like IP addresses used for single hosts, and is
written in the same way: A.B.C.D. Multicast addresses will never clash with
host addresses because a portion of the IP address space is specifically
reserved for multicast. This reserved range consists of addresses from
224.0.0.0 to 239.255.255.255. However, the multicast addresses from
224.0.0.0 to 224.0.0.255 are reserved for multicast routing information;
Application programs should use multicast addresses outside this range.
</snip>
So following that any address with that range e.g. 225.0.0.37 (And this will
never clash with a host IP address is this actually true and enforced ???)
It is.
Codewise, its just looks to me that you send to a multicast address, and to
receive just by joining the multicast group, does this sound right ???.
Exactly. Be aware though, that this doesn't work if you join a
Multicast group (via Open Transport) from a Classic application
running under OS X. You don't get any errors, but you don't get any
data packets either ;-) I think the send side works ok, though.
I have a bug filed on this one.
It works fine for native OS X apps, and "booted" OS 9.x though.
Mark
--
Mark Hunt, Light & Sound Design Ltd
(email@hidden)
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