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Maximum datagram size of 1200 is a requirement #4307

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Maximum datagram size of 1200 is a requirement #4307

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Maximum datagram size of 1200 is a requirement
martinthomson Oct 29, 2020
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martinthomson Oct 29, 2020
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3 changes: 2 additions & 1 deletion draft-ietf-quic-transport.md
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Expand Up @@ -4082,7 +4082,8 @@ QUIC assumes 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.
size of 1232 bytes for IPv6 and 1252 bytes for IPv4. Thus, modern IPv4
and all IPv6 network paths will be able to support QUIC.

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