Mar 3, 2020 · A 16-bit checksum only has 65,536 unique values, so it will be fairly common to repeat checksum values on multiple segments. What you have is not going to be unusual with …

May 12, 2016 · Because, the checksum is being calculated by the NIC, and not by the operating system. The wiki page you linked to did explain this: If you capture on a recent Ethernet NIC, …

You see the "incorrect" checksums due to a feature called TCP checksum offloading. The checksum fields for outgoing TCP packets are not pre-calculated by the operating system but …

Jan 13, 2019 · Checksum offload is generally quite reliable. The last NIC I knew of that had a bug around this was a 100 Mbps Sun hme interface, which had a problem with UDP checksum …

Oct 8, 2017 · If the TCP checksum is corrupted, then it will not match the TCP pseudo header and payload. There should only be one checksum that matches the pseudo header and payload, …

May 28, 2020 · C rejects the packet because of an invalid checksum. The source of my confusion comes from the Wikipedia pages for UDP, TCP, and ICMPv6 which state that the checksum is …

The checksum field is the 16 bit one's complement of the one's complement sum of all 16-bit words in the header and text. This seems a little crazy to me that the TCP checksum, which is …

Something that should be noted here, and that most people overlook completely, is the fact, that the TCP checksum is actually a very poor checksum. so the checksum of TCP is no good at …

May 16, 2013 · The complement is taken to make checksum validation simpler — instead of calculating the checksum again and then comparing the calculated value with the checksum …

Mar 3, 2017 · TCP checksum offloading. As already mentioned - is a technique where CPU does not calculate the TCP checksum but leaves this to NIC. The NIC may calculate it incorrectly. …