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Handshake packets aren't special #4853

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5 changes: 5 additions & 0 deletions rfc9002.md
Expand Up @@ -266,6 +266,11 @@ packets. While this increases network load, it is considered safe, since the
sender will still reduce its sending rate exponentially under persistent
congestion ({{pto}}).

## Handshake packets are not special

TCP treats the loss of SYN or SYN-ACK packet as persistent congestion and
reduces the congestion window to one packet ({{?RFC5681}}). QUIC treats
loss of a packet containing handshake data the same as other losses.

# Estimating the Round-Trip Time {#compute-rtt}

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