[nomel]

> Packet sequence numbers are never reused when retransmitting a packet. This avoids ambiguity about which packets have been received and avoids dreaded retransmission timeouts.

How does this work?

As a total guess, I assume the client gets a stream of packets, buffers them all up, waits for some threshold before re-requesting any missing sequence numbers. When that missing packet comes back in (all while the stream continued) with its new number, it puts in in place, and pushes the data up to the application and clears it's buffer. Client probably sends "I'm good up to sequence n" every once and a while so the server can clear it's re-transmit buffer.

That's pretty cool. Treat it as a lossy stream, rather than a "OH CRAP EVERYBODY STOP EVERYTHING, FRED FELL DOWN!". With this, FRED IS DED!