Re: [quicwg/base-drafts] The method of identifying "the same server" (#3155)

Kazuho Oku <notifications@github.com> Tue, 05 November 2019 04:13 UTC

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Date: Mon, 04 Nov 2019 20:13:41 -0800
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] The method of identifying "the same server" (#3155)
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> The client will not use the token if it has migrated to a different address. 

The specification is not written as such. Section 8.1.2 states, that _if the client has a token received in a NEW_TOKEN frame on a previous connection to what it believes to be the same server, it SHOULD include that value in the Token field of its Initial packet._ There is no requirement for the client to check it's address (or the network).

I think that the approach used by the specification is correct. In practice, I think we cannot assume that all the clients would correctly deal with their source address explicitly (as well as the change of the address). Besides, a change of source address does not necessarily mean that the client has migrated to a different network. Consider the case where a client goes out of one DHCP network, then returns to that network. In such case, the client might receive a different address, but it is still on the same network. After all, we are requiring the server to associate NEW_TOKEN tokens and the original source address. Then, why not let the server decide if a token can be reused?

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