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5 Installing 3Com Advanced Server Features For Windows
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Changing Windows 2000 Property Settings
If you receive warnings about inconsistent property settings (for example, the 802.1p Support
property) while creating a group, use the following procedure to change a NIC property:
1 Right-click the My Computer icon and select Properties from the menu.
2 Click the Hardware tab, then click Device Manager.
3 Double-click Network Adapters.
4 Right-click on the name of the appropriate NIC and select Properties from the menu.
5 Click the Advanced tab.
6 Select the appropriate property from the list (for example, 802.1p Support).
7 Use the scroll list to change the property value.
8 Exit the Device Manager.
Identifying Windows 2000 Miniport and LAN Connections
3Com Advanced Server miniport connections and NIC Local Area Connections are listed in
the Network and Dial-up Connections window. If a group or VLAN is associated with a
miniport, the group name and VLAN name appear in the miniport icon name. If a miniport is
associated with an ungrouped NIC, you can identify the NIC by its MAC address as follows:
1 In the Network and Dial-up Connections window, right-click the miniport icon and
select Properties from the menu.
2 In the DynamicAccess Properties window, click the General tab.
3 In the General tab, move the cursor over the miniport name. (Do not click the name.)
After a short pause, the MAC address of the associated NIC appears in a pop-up window.
Using Windows 2000 Offload Features
The 3C990B NIC supports Windows 2000 offload features in an IP environment. The
Windows 2000 offload features are designed to enhance the Windows 2000 operating
system capabilities by off-loading key TCP/IP networking and security tasks from the
Windows 2000 operating system:
■ IPSec Offload—reduces CPU utilization by allowing the 3XP processor and a crypto
chip on the NIC to perform data encryption operations.
■ TCP Segmentation Offload—reduces CPU utilization by allowing the 3XP processor
on the NIC to perform segmentation of TCP packets.
■ IP and TCP Checksum Offload—reduced CPU utilization by allowing the 3XP processor
on the NIC to perform the checksum calculation of TCP/IP and UDP/IP packets.
■ 802.1p Packet Priority Offload—reduces CPU utilization by allowing the 3XP processor
on the NIC to perform the insertion of the 802.1Q tag header into the packet.
NOTE: Windows 2000 does not allow IPSec offloads and TCP Segmentation
offloads for the same session. Though all offload types may be enabled, TCP
Segmentation offloading will not occur during an IPSec session.