The More You Know ★
Out of context: Reply #1559
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To understand the problem, it is worth first being aware that Deutsche Telekom (DTAG), as one of the largest Internet service providers in the world, sets a precise framework for the routes through which the subsidiaries belonging to the company group can direct their Internet traffic, together with all other similarly operating global multis. This is why the absurd situation can occur, that although Cloudflare is available via a direct port in the local dataplex belonging to a telecom provider, CF traffic still takes place via a Level3 connection for all telecom operators.
And this connection is congested from time to time, especially in the evening hours, and the logs show that the traffic always goes through an international line, even if someone happens to open a website hosted in the country.
Long story short if you're a DT (or one of DT's subs) customer, and your connection turns shit from time-to-time its because telekom is forcing traffic to a slower direction to access the CF servers.