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Network Interface Object

The Network Interface performance object consists of counters that measure the rates at which bytes and packets are sent and received over a TCP/IP connection. It includes counters that monitor connection errors.

The Network Interface counters display data about the network adapters on the server computer. The first instance of the Network Interface object (Instance 1) that you see in System Monitor represents the loopback. The loopback is a local path through the protocol driver and the network adapter. All other instances represent installed network adapters.

Counter Name Description Counter Type
Bytes Received/sec Shows the rate at which bytes are received over each network adapter. The counted bytes include framing characters. Bytes Received/sec is a subset of Network Interface\Bytes Total/sec. PERF_COUNTER_COUNTER
Bytes Sent/sec Shows the rate at which bytes are sent over each network adapter. The counted bytes include framing characters. Bytes Sent/sec is a subset of Network Interface\Bytes Total/sec. PERF_COUNTER_COUNTER
Bytes Total/sec Shows the rate at which bytes are sent and received on the network interface, including framing characters. Bytes Total/sec is the sum of the values of Network Interface\Bytes Received/sec and Network Interface\ Bytes Sent/sec. PERF_COUNTER_COUNTER
Current Bandwidth Shows an estimate of the current bandwidth of the network interface in bits per second (BPS). For interfaces that do not vary in bandwidth or for those where no accurate estimation can be made, this value is the nominal bandwidth. PERF_COUNTER_RAWCOUNT
Output Queue Length Shows the length of the output packet queue, in packets. If this is longer than two, there are delays and the bottleneck should be found and eliminated, if possible. Since the requests are queued by Network Driver Interface Specification (NDIS) in this implementation, this value is always 0. PERF_COUNTER_RAWCOUNT
Packets Outbound Discarded Shows the number of outbound packets to be discarded even though no errors had been detected to prevent transmission. One possible reason for discarding the a packet could be to free up buffer space. PERF_COUNTER_RAWCOUNT
Packets Outbound Errors Shows the number of outbound packets that could not be transmitted because of errors. PERF_COUNTER_RAWCOUNT
Packets Received Discarded Shows the number of inbound packets that were chosen to be discarded even though no errors had been detected to prevent their being deliverable to a higher-layer protocol. One possible reason for discarding such a packet could be to free up buffer space. PERF_COUNTER_RAWCOUNT
Packets Received Errors Shows the number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol. PERF_COUNTER_RAWCOUNT
Packets Received Non-Unicast/sec Shows the rate at which non-unicast (subnet broadcast or subnet multicast) packets are delivered to a higher-layer protocol. PERF_COUNTER_COUNTER
Packets Received Unicast/sec Shows the rate at which subnet-unicast packets are delivered to a higher-layer protocol. PERF_COUNTER_COUNTER
Packets Received Unknown Shows the number of packets received through the interface that were discarded because of an unknown or unsupported protocol. PERF_COUNTER_RAWCOUNT
Packets Received/sec Shows the rate at which packets are received on the network interface. PERF_COUNTER_COUNTER
Packets Sent/sec Shows the rate at which packets are sent on the network interface. PERF_COUNTER_COUNTER
Packets Sent Non-Unicast/sec Shows the rate at which packets are requested to be transmitted to nonunicast (subnet broadcast or subnet multicast) addresses by higher-level protocols. The rate includes packets that were discarded or not sent. PERF_COUNTER_COUNTER
Packets Sent Unicast/sec Shows the rate at which packets are requested to be transmitted to subnet-unicast addresses by higher-level protocols. The rate includes the packets that were discarded or not sent. PERF_COUNTER_COUNTER

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