Wireshark default does not check the checksum of the workaround

Wireshark starting from a version of 1.2, the checksum check of the TCP/UDP protocol is not turned on by default. Causes sometimes not to see whether the checksum of the packet is correct, the interface displays "validation disabled" (that is, disable verification):

This is because sometimes the checksum is calculated by the network card, at which time the Wireshark caught by the native sent packet checksum is wrong, so the default turns off the Wireshark own checksum. What to do if you need to open it. Can be opened manually in the Wireshark protocol settings:

You can then see in the Wireshark that the data packets are checked and correct.