This *Command enables or disables various protocol checksums, or, in the absence of parameters, reports the current usage of the checksums.
*InetChecksum [i|u|t On|Off]
| i | Set IP checksum usage |
| u | Set UDP checksum usage |
| t | Set TCP checksum usage |
| On | Enable checksum |
| Off | Disable checksums |
You should not alter these values unless you know what you are doing.