Is it possible for multiple QUIC connections to use the same "UDP connection" simultaneously?

[Nan Xiao]

Hi all,

Greetings from me!

Maybe a stupid question: As QUIC uses connection ID to differentiate connections, is it possible for multiple QUIC connections to use the same "UDP connection" simultaneously?

Thanks in advance!

Best Regards

Nan Xiao

[Srirama Nagaraj]

Hi Nan

As you might know, a UDP connection is defined by <IP, port>. The whole idea around QUIC is to open a single connection for a given pair of <IP, port> 

QUIC was never designed to have multiple connections for a given pair of <IP, port>

Moreover, the term "UDP connection" is itself ambiguous, as UDP is connectionless protocol. 

Regards,

Srirama Nagaraj

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[Marten Seemann]

QUIC allows multiplexing connections on the same IP/Port. It is even possible to run multiple QUIC clients on the same IP:port a QUIC server is listening on. In fact, we do exactly that in libp2p.

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[puneet kumar]

I think what he is asking is have different Connection IDs in a single QUIC connection (Which is already there) and then different QUIC connections using the same UDP pipeline.. I think you can get away with that but then you have to address what sriram mentioned.. someone distinguish each QUIC connection based on something instead of <IP, Port>

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[Nan Xiao]

Hi Sriram, Marten and Puneet,

Thanks for all your responses!

Yes, my intention is to ask whether multiple QUIC connections can use
the same UDP pipeline, i.e., the same Client and Server <IP, Port>
pair simultaneously.

Best Regards
Nan Xiao

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