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How many Initial packets shall carry the retry token?

Christian Huitema <huitema@huitema.net> Tue, 27 November 2018 22:01 UTC

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To: IETF QUIC WG <quic@ietf.org>
From: Christian Huitema <huitema@huitema.net>
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Cc: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
Message-ID: <c3114c82-885f-673a-0873-d5687f63394e@huitema.net>
Date: Tue, 27 Nov 2018 14:00:21 -0800
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Subject: How many Initial packets shall carry the retry token?
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We had a small problem during testing of "stateless retry" interop. One
of the implementation expected a token to be present in every Initial
packet, the other would only send it in the first packet that carried
the client Hello. The spec says:

   Upon receiving the client's Initial packet, the server can request
   address validation by sending a Retry packet (Section 17.7 <https://tools.ietf.org/html/draft-ietf-quic-transport-16#section-17.7>)
   containing a token.  This token is repeated by the client in an
   Initial packet after it receives the Retry packet.  In response to
   receiving a token in an Initial packet, a server can either abort the
   connection or permit it to proceed.

It is clear for the first Initial packet, but not entirely. Is it OK to
send consecutive packets like ACK without a token? Is it also OK to have
them carry a token?

-- Christian Huitema

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