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Multicast

Started by jonbell Dec 10, 2006 at 7:35 AM 6 replies 1.7k views

Original Post

Dec 10, 2006 at 7:35 AM

Is multicast possible over the internet? If even some routers and ISP's disable the feature then the answer is essentially no right? Cheers

elFarto

Dec 10, 2006 at 9:45 AM

While not directly possible with IPv4, take a look at the MBone. With IPv6 it should be possible.

Regards
elFarto

jonbell

Dec 10, 2006 at 10:15 AM

So the only practical way for my server to send a message over the net to all its clients is to do a seperate unicast to each one?

hplus0603

Dec 10, 2006 at 12:24 PM

Correct.

In general, IPv4 multicast is a pretty broken concept, as there is no central DNS-like authority -- every router on the internet needs to be aware of every multicast group, for you to be able to join them. Obviously, that won't scale.

jonbell

Dec 10, 2006 at 4:04 PM

So my last statement stands? Is the only way for my server to send a message to all its peers to unicast the message to each peer?

Kylotan

Dec 10, 2006 at 5:31 PM

That is why he used the word "correct".

Marius

Dec 12, 2006 at 4:13 PM

NO multicats is not possible over internet.

3dnewbie

Dec 19, 2006 at 8:11 AM

You could ofcourse just use a broadcast, but seeing as most routers block these you would be limited to your local network

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