On Tue, 30 Oct 2018 09:03:06 -0000, Jonathan Buzzard said: > Noting that on a TCP/IP network anything passing over a TCP connection > is checksummed at the network layer. Consequently any addition > checksumming is basically superfluous.
Note that the TCP checksum is relatively weak, and designed in a day when a 56K leased line was a high-speed long-haul link and 10mbit ethernet was the fastest thing on the planet. When 10 megabytes was a large transfer, it was a reasonable amount of protection. But when you get into moving petabytes of data around, the chances of an undetected error starts getting significant. Pop quiz time: When was the last time you (the reader) checked your network statistics to see what your bit error rate was? Do you even have the ability to do so?
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