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W: prefixes Windows Perfmon counters.
S: prefixes SiteScope counters.
Counters.chm file from the Windows 2000 Resource Kit.
Counters Packets Outbound Errors and Packets Received Errors indicate network card hardware problems.
Don't rely on the Current Bandwidth counter because it shows theoretical rather than actual bandwidth.
A reasonable limit for an Ethernet network is %Network Use less than 30 percent. A higher value means you need to speed up the network or reduce the amount of traffic.
Use the %Broadcast Frames and %Multicast Frames counters to view the percentages of broadcast and multicast traffic. Network cards pass broadcast and multicast frames to a higher-level software component before they act on or discard them. This extra activity results in additional CPU use.
As the requesting computer connects to find the server computer's network address, it generates broadcast traffic. Frame traffic increases as the server transfers the files.
Similarly, don't use the Output Queue Length counter because it's always zero, since transmission requests are not handled by the network card but by network device interface specification (NDIS) software.
Microsoft provides two versions of NetMon. Install the promiscuous version of Netmon from Microsoft's Systems Management Server (SMS) 1.2 and 2.0+ product to capture packets on all NICs on the same network subnet hub.
Otherwise, the network card typically rejects network traffic intended for other network cards.
Traffic through a switch (rather than a hub) may not be captured this way.
Netmon filter specifications are stored in the NetMon\Captures subdirectory. Netmon allows filtering by protocol, TCP/IP address, and data pattern.
This activity drains the resources of the computer you're analyzing, limit Network Segment monitoring. Monitoring Network Segment counters increases CPU use. As these counters process network traffic, they use additional system resources.
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