Re: [quicwg/base-drafts] Guidance for port number use (#495)

["Benjamin M. Schwartz" <[e-mail]>]

> There are now quite a few protocols that rely on mapping from a name to a URL using .well-known, which wouldn't work for QUIC without a well-known port. In a way we would be strengthening our reliance on our fallback protocol if we insist on randomizing.

Could you give an example?  Most .well-known uses I know of already have a port in addition to the name.  Also, we could require SRV records when using QUIC in contexts where the port is unknown.

> it would be good to understand what perceived benefits derive from that. For someone looking to use other ports, more use of non-443 ports might be good, but it's rare that the need is "use a particular port number" as opposed to something else. Understanding what that something else might be would probably help.

Needs I perceive:
 * Run a server as non-root without making clients do something unusual and poorly supported.  IMHO, requiring privilege to run an HTTP server (on port 80 or 443) has been a nontrivial cause of vulnerabilities in low-budget webservers.  Running HTTP on other ports is possible, but is not well-supported by clients (e.g. users can't just type a domain name into a URL bar).
 * Do P2P QUIC without fighting network ossification.  P2P QUIC could be useful for WebRTC-like applications, which will necessarily run on high-numbered ports.  Keeping those flows identical to client-server QUIC would help us avoid the kind of ossification that required awful workarounds in WebRTC, like ssltcp and TURN-TLS candidates.
 * Multihosting QUIC on IPv4 without SNI.   Making the port a first-class component of any QUIC address would give CDNs the option to offer each customer an isolated 3-tuple (IP, UDP, port) for QUIC serving, avoiding reliance on SNI (at least in QUIC).

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