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Datagram size, not packet size #4214

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Datagram size, not packet size #4214

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Datagram size, not packet size
janaiyengar Oct 14, 2020
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5 changes: 3 additions & 2 deletions draft-ietf-quic-transport.md
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Expand Up @@ -4060,15 +4060,16 @@ datagram size includes one or more QUIC packet headers and protected payloads,
but not the UDP or IP headers.

The maximum datagram size is defined as the largest size of UDP payload that can
be sent across a network path using a single UDP datagram. The maximum datagram
size MUST be at least 1200 bytes.
be sent across a network path using a single UDP datagram.
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QUIC depends upon a minimum IP packet size of at least 1280 bytes. This is the
IPv6 minimum size ({{?IPv6=RFC8200}}) and is also supported by most modern IPv4
networks. Assuming the minimum IP header size of 40 bytes for IPv6 and 20 bytes
for IPv4 and a UDP header size of 8 bytes, this results in a maximum datagram
size of 1232 bytes for IPv6 and 1252 bytes for IPv4.

The maximum datagram size MUST be at least 1200 bytes.

Any maximum datagram size larger than 1200 bytes can be discovered using Path
Maximum Transmission Unit Discovery (PMTUD; see {{pmtud}}) or Datagram
Packetization Layer PMTU Discovery (DPLPMTUD; see {{dplpmtud}}).
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