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A lot of firewalls are blocking UDP and unknown L4 protocols so QUIC is blocked either way. QUIC can only work because happy eyeballs falls back to HTTP/2. UDP

by wmf 3y ago

A lot of firewalls are blocking UDP and unknown L4 protocols so QUIC is blocked either way. QUIC can only work because happy eyeballs falls back to HTTP/2. UDP is definitely better for NATs since they don't know how to translate unknown protocols (e.g. SCTP).

hot_gril 3y ago
Which firewalls are broadly blocking UDP? I haven't seen that on a residential router or ISP. Lots of things rely on UDP already.
- wmf 3y ago
  Corporate firewalls tend to be much more restrictive than consumer.
  - hot_gril 3y ago
    Yeah, if it's just corporate falling back to HTTP2 (or maybe more realistically, HTTP1), then I think it's alright. Same corporate users delayed leaving unencrypted HTTP, broken versions of TLS, Windows XP, etc yet everyone else adopted anyway. They'll either follow suit eventually or work around it.