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While it’s true that UDP was often blocked by default infrastructure is now opened up in order to support HTTP/3 as operators notice its importance. However th
by Matthias247 5y ago
While it’s true that UDP was often blocked by default infrastructure is now opened up in order to support HTTP/3 as operators notice its importance.
However that will also often mean Http/3 and Quic will often only work on UDP port 443 - even though theoretically any port could be used for it (the number is delivered via the Alt-Svc announcement)
- egberts1 5y agowont be easy unless they also deploy mitigation for UDP-based DDoS.
- jlokier 5y agoThere are also sites that previously allowed UDP which started blocking UDP port 443 specifically to block QUIC and force fallback to HTTP/2 or lower. Reasons include some forms of traffic fairness management on mobile networks (to ensure throughout and low latency, it's much easier with TCP), and some corporate network security products to monitor traffic destinations at the domain level.