Capture Network Adapter Connection Speed with Custom Inventory

After much research, we have found that it is possible to capture the configured speed of network cards. This is found in the root\WMI namespace in the MSNdis_LinkSpeed class.

Note that the link speed is the configured speed regardless of whether it is automatically or manually configured.

Also, the speed is in KB and the right-most digit is a single decimal. That means that 100000 is 10,000.0 KB/S.

Here is a sample custom inventory source:

<InventoryClasses>
<InventoryClass name='linkspeed' manufacturer='Altiris' description='' version='1.0' platform='Win32' mifClass='Altiris|MyCustomClass|1.0'>
<xml xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema">
<s:Schema id="RowsetSchema">
<s:ElementType name="row" content="eltOnly" rs:updatable="true">
<s:AttributeType name="c0" rs:name="Active" rs:number="1" rs:nullable="true" mifAttrId="1">
<s:datatype dt:type="string" dt:maxLength="255"/>
</s:AttributeType>
<s:AttributeType name="c1" rs:name="InstanceName" rs:number="2" rs:nullable="true" mifAttrId="2">
<s:datatype dt:type="string" dt:maxLength="255"/>
</s:AttributeType>
<s:AttributeType name="c2" rs:name="NdisLinkSpeed" rs:number="3" rs:nullable="true" mifAttrId="3">
<s:datatype dt:type="string" dt:maxLength="255"/>
</s:AttributeType>
</s:ElementType>
</s:Schema>
<rs:data>

  <%foreach wmiobject="o" namespace="root\WMI" wql="SELECT * FROM MSNdis_LinkSpeed" %>
    <z:row 
      c0 ="<%writexml "wmi:o.Active"%>"
      c1 ="<%writexml "wmi:o.InstanceName"%>"
      c2 ="<%writexml "wmi:o.NdisLinkSpeed"%>"
    />
  <%next%> 

</rs:data>
</xml>
</InventoryClass>
</InventoryClasses>