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Re:Show HN: Rust Library to check your Internet connectivity by maltalex on Tuesday May 28, 2019 @08:24AM (#20029330)
I don't think there's a reason to use TCP for this unless you want to check for TCP connectivity specifically.

Just do a DNS lookup against a list of well-known public DNS servers.

Re:Show HN: Rust Library to check your Internet connectivity by oconnor663 on Tuesday May 28, 2019 @06:17PM (#20034974)
One reason not to do DNS exclusively is that many networks allow DNS requests (and intercept them) but block HTTP requests.
Re:Show HN: Rust Library to check your Internet connectivity by jesusprubio on Wednesday May 29, 2019 @02:42AM (#20037391)
BTW, there're parts of DNS over TCP.