Fast Address Validation - about

["Qing An" <[e-mail]>]

Hi Martin, Jana, 

I read through https://www.ietf.org/id/draft-ietf-quic-transport-23.txt and have a few comments and ideas to discuss.

[QUIC-Trans] defines a token based scheme to facilitate address validation of a client. The token MUST be covered by integrity protection against modification or falsification by clients. The server remembers the value it sends to clients and validates the token sent back from a client. In its design, Retry packet is used to deliver the token to a client which address has not yet been validated. It voids the first transmission of the Initial packet sent by the client, and triggers a second Initial packet to be sent with the token. The exchange of token will cause longer connection establishment delay for a client.
To improve the efficiency of address validation during handshake, one idea is that the same token can be exchanged via a different container i.e. the Handshake packet, that eliminates the use of Retry packet for token delivery. 

I am working on the complete draft and will submit it by Friday. Before that, hope this can be discussed in email first.

BR,
Qing An