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Local networks where multicast is not supported

Posted on 2006-11-29
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Last Modified: 2010-04-10


How often it can happens?

We use multicast to find other clients in the local network.

Windows network only if it make a sense.
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Question by:cdesigner
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by:giltjr
ID: 18042858
What?  I am not sure I understand.

All local networks should support Multicast.  However in order to receive a multicast packet, you must have something that is listening on a specific multicast address.
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by:cdesigner
ID: 18044626
I just want to know,  any possibility that some of our clients does not support multicast in the local network.
Is it possible at all? That the local network does not support multicast.
Maybe some old hardware may cause this problems ( routers, hubs, switches etc. )?

Currently we use broadcast ( and multicast as an option ), but we think to set multicast by default and we want to know about any possible problems.
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by:giltjr
ID: 18045220
HUB would cause no problem as they are only electronic switches, no smarts, no frame or packet inspection.

Older layer 2 switches would also cause no problem as they do not look any further than the layer 2 headers.

Newer switches, layer 3 switches could be configured to block multicast packets, but they would have to be configured that way on purpose.  Most routers do not router multicast packets.

You should encounter about the same issues with broadcast.  Broadcasts can not cross routers, thus they can't cross physical LAN segments or logical (VLAN's).  
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by:cdesigner
ID: 18047201
router not a problem. ok, I will try again ;)

We use broadcast now. Is it possible that somewhere broadcast will work but multicast not? ( without any special attention to switch configuration )
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giltjr earned 200 total points
ID: 18047946
Off hand I can't think of a "normal" situation where broadcast would work, but multicast would not.
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by:Trilotech
ID: 18050448
If you are talking about a multicast from your office that you want someone else to get from a remote office via the internet, then you will have problems as the internet does not widely support multicast.

For multicast to work everything would need to be internal.
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