Re: [quicwg/base-drafts] Path Challenge Padding and Amplification Protection (#4257)

[Kazuho Oku <[e-mail]>]

> And, just so my understanding is clear, if I receive a minimum size packet (10ish byte UDP payload?) from an unvalidated path on average 1/2 x INIT_RTT, then I will be amplifying that traffic by ~100x, right?

For one unvalidated path, an endpoint would send no more than 2 MTU worth of data per every Initial RTT (333ms). Therefore, while the amplification factor will be large, the amount of traffic being sent is going to be small.

For all the unvalidated paths from which an endpoint might receive data, the upper bound would be 2 MTU multiplied by the number of paths that an endpoint can validate concurrently. From what I understand, each path validation attempt is abandoned by a timeout, that is greater than 2 seconds ([section 8.2.4](https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#section-8.2.4-2)).

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/4257#issuecomment-716230658