TCP checksums are fairly simple; a TCP stack basically just sums up the 16-bit w...

		limmeau on Feb 12, 2009 \| parent \| context \| favorite \| on: Fun With HTTP Headers TCP checksums are fairly simple; a TCP stack basically just sums up the 16-bit words in a packet and stores the result in the checksum field; this will not detect 16-bit words being swapped around. My guess is that the load balancer tried to invalidate the header while preserving the TCP checksum.

Ah yes, forgot about the checksum field :) thx