If I'm correctly reading into how OpenVPN works the server is in some 
sense stateful in that it has to remember the association of the 
original source address of a client with the client's VPN address in 
order to route a reply packet back to it.  Are there other things it 
remembers about the connection?

Second question, when using UDP as the protocol, what handles the 
reliability function?  Do the VPN server and client track packet 
transmission and receipt by whatever means or do they simply 
transmit/receive packets and let the embedded protocol handle reliability?

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