will tcp checksum mechanism work correctly all the time? -



will tcp checksum mechanism work correctly all the time? -

i wondering if tcp checksum mechanism ensure tcp info same original, there conditions checksum won't work? didn't find reference that.

i have illustration create sentiment clear.

the original tcp info 11111111 11111111 00000000 00000000 ...... , changed 011111111 11111111 10000000 00000000 ...... when travelling on physical layer.

the end side have same checksum , take tcp info wrong.

i pretty new networking.

there little chance info corruption preserve checksum or corrupt checksum corrupted checksum matches corrupted data. applications require higher level of assurance tcp provides have add together own protection.

of course, provides no protection whatsoever malicious adversary. can trivially adjust both info , checksum if can intercept , modify packets.

tcp checksum

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