[quicwg/base-drafts] How many datagrams can a client send prior to validating the path? (#2135)

[Kazuho Oku <[e-mail]>]

To avoid it being used as a DDoS attack vector, we forbid the server from sending more than three datagrams before the path is validated during the handshake.

Do we need similar safeguard for the number of datagrams that a client may emit before it sees a packet from the server? IMO, it might be worth considering, due to the following reasons:

* The attack vector exists. For example, an attacker can inject a DNS response for a huge website to a DNS server. Then, clients would start sending 0-RTT packets to the victim.
* The number of packets that the client can send prior to path being validated was one for TCP. The QUIC transport draft is silent about the limit (though INITCWND would practically become in play here).

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