[tor-relays] Do middle nodes create multiple connections to the same Exit node? (with different source port)

[don.gould at tuta.io]

Hello,

Do middle nodes create multiple connections to the same Exit node? (with different source port)

The reason I ask is because I am a little confused. Even the tor relay operators are completely honest and don't log anything, the ISP / upstream ISP could still log all the connections. 

So they can see: [MiddleNode IP]:[Source Port] ==> [ExitNode IP]:[Dest Port (ORport)] -- Timestamp + Duration of connection.

So if I create a long running ssh connection that is going for 6 hours this will be unique to the middle node.

During this 6 hours, if another tor client chooses the same MiddleNode + ExitNode, does the MiddleNode create a new connection to the ExitNode? (Can be found out using netstat)

Or does it use the same connection that it already has established with the exit node? 

Thanks.
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