0
votes
2answers
193 views

Unable to POST/Upload files to a PHP page

I have a weird problem when I try to post contents or upload files by php to my server. After submitting the form it sleeps for a while then shows a page loading error. I tried different contents and ...
-2
votes
4answers
255 views

Why is the TCP checksum inverted?

From the Wikipedia page: 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. Why, after summing the 16-bits in the header ...
0
votes
1answer
49 views

TCP: Redundant checksum avoidance specification

TCP provides a mechanism to change the checksum scheme used by the two parties in a TCP session. There are four allowed checksum schemes according to this table, the last being "Redundant Checksum ...
1
vote
2answers
589 views

Is the TCP checksum over the payload?

I was somehow convinced that the TCP checksum was a header checksum (similar to the IP checksum), but I'm now having doubts reading the Wikipedia article: The checksum field is the 16 bit one's ...