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Corruption Analysis
nosyweb.net.3267 > surfer.my.net.80: R 734434465:734435925(1460) ack 2309258966 win 0 (DF)
router.my.net > nosyweb.net: icmp: host surfer.my.net unreachable - admin prohibited filter
IP checksum and header correct, otherwise router.my.net would discard
TCP segment corruption?
- Never reached destination host
- Router rejected packet because filtered
- Can’t see how destination host reacts
- Possible to manually compute checksum to investigate corruption
Possible checksum is correct, but 16-bit fields swapped
Notes: