Re: [quicwg/base-drafts] Allow PING in Initial/Handshake? (#3034)

[Kazuho Oku <[e-mail]>]

While I am fine with allowing PING frames in Initial and Handshake, I wonder what the benefit is.

IIUC, the reason of sending PINGs in case of PTO is to determine if a previously sent ack-eliciting packet has reached the peer. That is determined by the peer sending an ACK.

However, in case of Initial and Handshake packets, the only case when PTO fires and you do not have any data to send is when the endpoints are ready to switch to the next epoch. To rephrase, I think there might be a high chance of the endpoint not receiving an ACK due to the peer dropping the Initial keys (or the Handshake keys).

Considering that, I am not sure if it is a good advice to suggest endpoints send PINGs on PTO. Rather, I think it might be worthwhile to suggest that when discarding a packet number space, unconfirmed loss does not affect the CWND.

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