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add an introduction for testing of ECN support #4141

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merged 2 commits into from Sep 23, 2020
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add an introduction for testing of ECN support #4141

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add an introduction for testing of ECN support
marten-seemann Sep 23, 2020
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Update draft-ietf-quic-transport.md
marten-seemann Sep 23, 2020
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7 changes: 4 additions & 3 deletions draft-ietf-quic-transport.md
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Expand Up @@ -1463,9 +1463,10 @@ properties:
* authenticated negotiation of an application protocol (TLS uses ALPN
{{?ALPN}} for this purpose)

An endpoint verifies support for Explicit Congestion Notification (ECN) by
observing whether the ACK frames acknowledging the first packets it sends carry
ECN counts, as described in {{ecn-validation}}.
Endpoints can use packets sent during the handshake to test for Explicit
Congestion Notification (ECN) support; see {{ecn}}. An endpoint verifies support
for ECN by observing whether the ACK frames acknowledging the first packets it
sends carry ECN counts, as described in {{ecn-validation}}.

The CRYPTO frame can be sent in different packet number spaces
({{packet-numbers}}). The offsets used by CRYPTO frames to ensure ordered
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