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4 Using Windows Offload Features
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The following table describes values for the offload functions:
Configuring Offloads for a Group of Different NICs
Your computer may contain a combination of installed NICs (including one or more 3Com
3CR990-FX-97 NICs with varying offload capabilities. If you have a mix of dissimilar NICs
configured in a group, then 3Com DynamicAccess Advanced Server software supports
only those offload functions that are supported by all the NICs in the group.
For example, if you have created a group consisting of a 3CR990-FX-97 NIC and another
NIC that does not have any offload capabilities, then the group does not support any
offloads.
In another example, if you have a group of three NICs with two supporting TCP
Checksum, TCP Segmentation, and IPSec offloads, and one supporting only IPSec, then
the group supports only IPSec offloads.
If you add a NIC to an existing group, and that NIC has offload capabilities that differ from
those of the group, then you must reconfigure the group: that is, you must delete the
group, recreate the group, and restart the computer. (If you do not delete and recreate the
group, the Advanced Server software does not bind to the NIC.)
Similarly, if you replace a NIC that has been configured as part of a group with another
NIC that has different offload capabilities, then you must reconfigure the group.
In addition, if you disable or enable any offloads for a group through the Windows 2000
Advanced tab, then you must reconfigure the group.
Configuring IPSec Offloads
The 3CR990-FX-97 NIC performs data-encryption-processing offloads in Windows 2000
and Windows XP environments. The 3CR990-FX-97 NIC does not actually encrypt the
data: the operating system performs that function.
Encryption processing is handled entirely by the 3XP processor on the NIC. The 3XP
processor enables true end-to-end network security at the data capacity of the connected
network cable without sacrificing performance.
Internet Protocol Security (IPSec) is a framework of open standards for ensuring secure
private communications over IP networks. IPSec ensures confidentiality, integrity, access
control, and authenticity of data communications across a public IP network.
Value Offload Function Enabled
All Offloads Disabled No offloads
cksum TCP Checksum
cksum-ipsec TCP Checksum and IPSec
cksum-tcpseg TCP Checksum and TCP Segmentation
cksum-tcpseg-ipsec TCP Checksum and TCP Segmentation and IPSec
ipsec IPSec
tcpseg TCP Segmentation
tcpseg-ipsec TCP Segmentation and IPSec