_VLAN_OPTION): The 4 extra bytes in the Ethernet header affect the hardware calculated checksum. software must subtract out the 1st two 16-bit words starting at the 15th byte.</li></ul>
<p>
<h3>Transmit Checksum Offloading</h3>
<p>
For transmit, the software can specify where in the frame the checksum calculation is to start, where the result should be inserted, and a seed value. The checksum is calculated from the start point through the end of frame.<p>
The checsum offloading settings are sent in the tran