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AT-29xx Series Gigabit Ethernet Network Adapters Installation Guide
61
Note
The IPSec Offload feature applies only to Windows Vista and
Windows 7.
To change the IPSec Offload setting, do the following:
1. For Windows Server 2003 and Windows XP systems, access the
System Properties Dialog Box. See “Modifying Configuration
Properties” on page 39.
For Windows 2008 R2, Windows 7, and Windows Vista systems,
access the Device Manger for your operating system:
To access the Device Manager window in Windows 2008 R2 or
Windows 7, see “Selecting the Device Manager in Windows 2008
R2 and Windows 7” on page 44.
To access the Windows Vista Device Manager, see “Selecting the
Device Manager in Windows Vista” on page 46.
2. From the Advanced tab under P
roperty, select IPSec Offload.
For an example of the Advanced tab, see Figure 21 on page 56.
3. From the V
alue list on the Advanced tab, select one of the following:
Auth Header & ESP Enabled
Auth Header Enabled
Disabled
ESP Enabled
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 as described in “LEDs” on page 18.
Large Send
Offload Property
Normally, the protocol stack performs TCP segmentation. When you
enable the Large Send Offload property, the network adapter does the
TCP segmentation. There are several Large Send Offload properties to
choose from, depending on the TCP/IP version you are using on your PC.
You can select IPV4, IPV4 version 2, or IPv6 version 2. By default, the
Large Send Offload Property is disabled.