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Pad when validating addresses #4226

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7 changes: 7 additions & 0 deletions draft-ietf-quic-transport.md
Expand Up @@ -2210,6 +2210,13 @@ frame to at least the smallest allowed maximum packet size of 1200 bytes.
Sending UDP datagrams of this size ensures that the network path supports a
Path Maximum Transmission Unit (PMTU); see {{datagram-size}}.

Note:

: Probing with datagrams of 1200 bytes does not guarantee that the return path
also supports the same MTU. Migration to a path that can only carry a 1200
byte UDP payload in one direction will result in the peer being unable to
validate the path.
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### Path Validation Responses

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