ISP Throttling

Also known as: bandwidth shaping

Deliberate rate limiting applied by an access provider to traffic classified as bulk transfer, historically including plaintext NNTP on port 119. The symptom is a download that plateaus far below the line rate, often only during peak evening hours. Encrypted sessions on port 563 defeat classification by payload, but destination address and sheer transferred volume remain visible, so shaping can still be applied.

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