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If a client connects to one vpn server, can it join a video meeting which is based on IGMP?

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2 Answers 2

RFC4045 describes extensions to support multicast over L2TP protocol. So, it seems possible, but it depends on the implementation you use.

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In addition to what Khaled had written, there are other encapsulation protocols which would support Multicast encapsulation - GRE for example. Most "multicast tunneling" techniques allow multicast transmissions to cross unicast-only networks using GRE. The more advanced and flexible version of tunneling is AMT which is in the standardization process for about a decade now, but has working implementations and sees some use.

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