Allied Telesis AT-2912T - Manual (Page 69)

Secure Ethernet Network Adapters Installation and User’s Guide
69
Updating the
Checksum
Offload Property
Usually, the Checksum Offload function is computed by the protocol stack.
By selecting one of the Checksum Offload properties, the adapter can
compute the checksum.
To change the Checksum Offload setting, do the following:
1. Access the Advanced tab:
 For Windows Server 2003 Operating systems, see “Selecting the
Advanced Tab in Windows Server 2003 or Windows XP” on
page 58.
 For Windows 7 Operating systems, see “Selecting the Advanced
Tab in Windows 7” on page 61.
 For Windows Vista Operating systems, see “Selecting the
Advanced Tab in Windows Vista” on page 63.
The Advanced tab is shown in Figure 30 on page 60.
2. From the Property list under the Advanced tab, select IPv4 Checksum
Offload or IPv6 Checksum Offload.
3. From the Value list on the Advanced tab, select one of the following:
 None - Disables checksum offloading.
 Rx TCP/IP Checksum - Enables receive TCP, IP, and UDP
checksum offloading.
 Tx TCP/IP Checksum - Enables transmit TCP, IP, and UDP
checksum offloading.
 Tx/Rx TCP/IP Checksum (default) - Enables transmit and receive
TCP, IP, and UDP checksum offloading.
4. Click OK.
5. If prompted to restart your computer, click Yes.
Although it is not necessary to reboot the system for new adapter
properties to take effect, rebooting is recommended to reinitialize all
registers.
6. Verify that the port LED operates correctly. See one of the following
descriptions:
 “AT-2712FX/SC and AT-2712LX20/SC Adapters Physical
Descriptions” on page 17
 “AT-2912T Adapter Physical Description” on page 18