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Make the DF requirement a "MUST, unless". #4140

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2 changes: 1 addition & 1 deletion draft-ietf-quic-transport.md
Original file line number Diff line number Diff line change
Expand Up @@ -4028,7 +4028,7 @@ smallest allowed maximum packet size of 1200 bytes.

UDP datagrams MUST NOT be fragmented at the IP layer. In IPv4
({{!IPv4=RFC0791}}), the DF bit MUST be set to prevent fragmentation on the
path, unless the underlying network stack does not offer an API for doing so.
path, if possible.


## Initial Packet Size {#initial-size}
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