As shown in figure, the Internet is normal, accidentally discovered the routing has caught functions, caught a few times have large TCP checksum error,

IP routing 192.168.3.1

Computer IP 192.168.3.50

TCP checksum error seems to have appeared in the process of computer and routing communication

Two the same router, one at home, one in the office, at home on computers and office computer have tried it on, appear this kind of situation,

Wiresharks prompt strategized cased by the TCP checksum offload, but, if is due to network card hardware check, why other TCP packet checksum is correct?