When two hosts exchange packets through a few LANs, if there are corruptions in packets, it's going to be likely caught by the ethernet frame CRC and dropped by either router/switch/PC NIC. Wonder if this is a correct assumption. asked 08 Nov '15, 05:44  pktUser1001 |
One Answer:
Yes, the assumption is correct, even though the FCS may still match for corrupted packets on very rare occasions. answered 08 Nov '15, 06:52  Jasper ♦♦ |
Agree. FCS and IP/TCP header checksum use different algorithm. So that's possible. Thanks.
Recently we experienced a faulty network device that was corrupting packets internally but sending valid Ethernet frames containing that corrupted data, so I don't think this is necessarily a correct assumption. Statistically speaking, it's probably safe to say that in most cases the FCS will catch the bad frames, but in cases like this, it won't.