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Clarification and minor addition to ICMP PTB text #2108

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Dec 18, 2018
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Clarification and minor addition to ICMP PTB text #2108

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Clarification and minor addition to ICMP PTB text
igorlord Dec 10, 2018
10dffa5
Use "addresses" instead of "4-tuple"
martinthomson Dec 11, 2018
30dba73
reflow text
igorlord Dec 11, 2018
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4 changes: 2 additions & 2 deletions draft-ietf-quic-transport.md
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Expand Up @@ -3116,8 +3116,8 @@ PMTU discovery {{!RFC1191}} {{!RFC8201}} relies on reception of ICMP messages
(e.g., IPv6 Packet Too Big messages) that indicate when a packet is dropped
because it is larger than the local router MTU. DPLPMTUD can also optionally use
these messages. This use of ICMP messages is potentially vulnerable to off-path
attacks that successfully guess the addresses used on the path and reduce the PMTU to
a bandwidth-inefficient value.
attacks that successfully guess the addresses used on the path 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.
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