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Don't let the PMTU drop below 1280 #2069

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Don't let the PMTU drop below 1280 #2069

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3 changes: 3 additions & 0 deletions draft-ietf-quic-transport.md
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Expand Up @@ -3068,6 +3068,9 @@ these messages. This use of ICMP messages is potentially vulnerable to off-path
attacks that successfully guess the IP address 3-tuple and reduce the PMTU to a
bandwidth-inefficient value.

An endpoint MUST ignore an ICMP message that claims the PMTU has decreased below
1280 bytes.

QUIC endpoints SHOULD provide validation to protect from off-path injection of
ICMP messages as specified in {{!RFC8201}} and Section 5.2 of {{!RFC8085}}. This
uses the quoted packet supplied in the payload of an ICMP message, which, when
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