On 2/2/2022 6:38 AM, Harald Barth (h...@kth.se) wrote: > I guess your IP provider lives in the IT world of 2022 where "Internet > service" consists of mostly TCP/HTTPS and definitely not UDP ;-)
It is unlikely that an ISP is blocking UDP traffic. The most likely causes are a poorly implemented firewall in a home router or an organizational firewall that is blocking a range of IP addresses which have been used in prior attacks. UDP is not only used for DNS and Kerberos but also for QUIC. It has been reported[1] that more than half of the web browser connections from Chrome browers to Google's servers are performed using the UDP based QUIC protocol. Jeffrey Altman [1] https://techcrunch.com/2015/04/18/google-wants-to-speed-up-the-web-with-its-quic-protocol/
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