Date: Mon, 22 Apr 2019 21:48:15 -0700
From: Marten Seemann <notifications@github.com>
Reply-To: quicwg/base-drafts
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Message-ID: <quicwg/base-drafts/issues/2640@github.com>
Subject: [quicwg/base-drafts] client should send PING in Initial or Handshake, 
 but PINGs are forbidden in these packets (#2640)
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The [text about the crypto timer](https://quicwg.org/base-drafts/draft-ietf-quic-recovery.html#crypto-retransmission-timeout) says:
> If the crypto retransmission timer expires before the client has 1-RTT keys, it is possible that the client may not have any crypto data to retransmit. However, the client MUST send a new packet, containing only PING or PADDDING frames if necessary, to allow the server to continue sending data. If Handshake keys are available to the client, it MUST send a Handshake packet, and otherwise it MUST send an Initial packet in a UDP datagram of at least 1200 bytes.

PING frames are forbidden in both Initial and Handshake packets.

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<p>The <a href="https://quicwg.org/base-drafts/draft-ietf-quic-recovery.html#crypto-retransmission-timeout" rel="nofollow">text about the crypto timer</a> says:</p>
<blockquote>
<p>If the crypto retransmission timer expires before the client has 1-RTT keys, it is possible that the client may not have any crypto data to retransmit. However, the client MUST send a new packet, containing only PING or PADDDING frames if necessary, to allow the server to continue sending data. If Handshake keys are available to the client, it MUST send a Handshake packet, and otherwise it MUST send an Initial packet in a UDP datagram of at least 1200 bytes.</p>
</blockquote>
<p>PING frames are forbidden in both Initial and Handshake packets.</p>

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