Re: [quicwg/base-drafts] 5tuple routing (#3536)

Martin Thomson <notifications@github.com> Mon, 30 March 2020 22:44 UTC

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Date: Mon, 30 Mar 2020 15:44:28 -0700
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] 5tuple routing (#3536)
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@martinthomson commented on this pull request.



> @@ -1156,6 +1156,34 @@ SHOULD ignore any such packets.
 
 Servers MUST drop incoming packets under all other circumstances.
 
+### Considerations for 5-tuple routing architectures
+
+QUIC endpoints can be deployed behind a 5-tuple based routing architecture that
+delivers packets based on both the source and destination IP addresses and
+ports. When routing depends on addresses that the endpoint does not control,
+changes to the IP address or port of peers could result in packets being routed
+to a different server. The following actions could mitigate or resolve
+operational and security issues in this case:
+
+* Endpoints can use an out-of-band mechanism to deliver packets to the correct
+destination or transfer state from the original destination.
+
+* A server can request that a connection be migrated to an address that is
+unique using the preferred_address transport parameter. For example, the initial

Uniqueness is correct though.  The point is that the address is *in itself* sufficient for routing, for which uniqueness is necessary.  Stability is necessary for other reasons.  

That all said, it is true that linkability is a natural consequence of this.  We need to highlight that.  Servers that use this style of demultiplexing will create linkability between paths.  That's a big deal that needs to be highlighted.

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