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janaiyengar authored and kazuho committed Oct 15, 2020
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11 changes: 5 additions & 6 deletions draft-ietf-quic-transport.md
Expand Up @@ -4085,12 +4085,11 @@ A client MUST expand the payload of all UDP datagrams carrying Initial packets
to at least the smallest allowed maximum packet size (1200 bytes) by adding
PADDING frames to the Initial packet or by coalescing the Initial packet; see
{{packet-coalesce}}. Similarly, a server MUST expand the payload of all UDP
datagrams carrying ack-eliciting Initial packets. Sending UDP datagrams of this
size ensures that the network path supports a reasonable Path Maximum
Transmission Unit (PMTU), in both directions. Additionally, a client padding
Initial packets helps reduce the amplitude of amplification attacks caused by
server responses toward an unverified client address; see
{{address-validation}}.
datagrams carrying ack-eliciting Initial packets to at least the smallest
allowed maximum packet size (1200 bytes). Sending UDP datagrams of this size ensures that the network path supports a reasonable Path Maximum Transmission Unit
(PMTU), in both directions. Additionally, a client that expands Initial packets
helps reduce the amplitude of amplification attacks caused by server responses
toward an unverified client address; see {{address-validation}}.

Datagrams containing Initial packets MAY exceed 1200 bytes if the sender
believes that the network path and peer both support the size that it chooses.
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