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Overview The installation of the Interface Monitor Plugin
is performed in the directory workspace. You should see the following result in your
workspace. By a double click on the hammer icon you should start the Plugin Dialog Window and could configure it. The configuration of the Interface Monitor is performed
directly in the Plugin main window. You should first select an interface frome the list. You should set a polling interval. If the polling interval is high the line graph x scale will be bigger and thus you will have a view on a longer time period. If you want to be warn when a load threshold is reached you have to set up the three fields. "If usage >" parameter specifies
the load threshold in % above which you want to be warn. The information provided by the various indicators present in the screen are all very instructive and give rich information on the interface traffics and errors. Here is the list of these indicators. Graph
: Incoming/Outgoing for interface index ... Graph : Incoming/Outgoing for interface index ... This graph displays the number of octets sent and received by the interface. The in (yellow) line display the incoming octet value, the out (purple) line displays the ougoing octet value. Both value comes from the ifOutOctets OID (The total number of octets transmitted out of the interface, including framing characters) and ifInOctects OID (The total number of octets received on the interface, including framing characters.
The value displayed on the y-axis is the number of inbound or ounbond Octets counted during the polling interval. The octet value depends from the polling interval selection. if you want to know the octet/second values you should do the following conversion. y-axis value / Polling interval = Octets per second (average) If you want to have a speed value in bits per second the formula is : (y-axis value / Polling interval) * 8 = Bits per second (average) With this formula, remenber that more the polling interval is high more the value is averaged. In other words, if your traffic contains surges you could miss them. The following table gives you examples of values for various interface types, various polling intervals and various loads.
This graph displays the percentage of load for the interface. Two lines, one for the incoming traffic, one for the outgoing traffic are represented. The % of load is calculated by : (Octets per second / Polling interval) / ((Speed of interface in Bits per second) / 8 / 100 ) The maximum reached by one of both indicator is displayed as a white line and its value is indicated on the right side (82.10 % for the Inbound load in our example). Error packet are malformed packet at the link control layer, Ethernet for example, that could not be used by upper applications. The maximum reached by one of both indicators is displayed as a white line and its value is indicated on the right side. The value displayed on the y-axis is the number of inbound or outbound packets counted during the polling interval. This table gives you the value in Pkts/s and their corresponding values for various polling interval .
In our screen shot the maximum value recorded is 5817 packets. It gives us an average of 1164 Packet per second. The graph displays the number of inbound and outbound packets which 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. The maximum reached by one of both indicator is displayed as a white line and its value is indicated on the right side. The value displayed on the y-axis is the number of inbound or outbound packets counted during the polling interval. This field displays information about the Network
interface. Description. The name given to the interface for better identification Type. The type of interface, distinguished according to the physical/link protocol(s) immediately below the network layer in the protocol stack. MTU (maximum Transmit Unit). The size of the largest datagram which can be sent/received on the interface, specified in octets. For interfaces that are used for transmitting network datagrams, this is the size of the largest network datagram that can be sent on the interface. Speed. An estimate of the interface's current bandwidth in bits per second. For interfaces which do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth. Physical address. The interface's address at the protocol layer immediately `below' the network layer in the protocol stack. For interfaces which do not have such an address (e.g., a serial line), this object should contain an octet string of zero length.
The desired state of the interface. The states could be :
The testing(3) state indicates that no operational packets can be passed.
The number of packets received via the interface which were discarded because of an unknown or unsupported protocol. Accepted protocols should be supported by the type of interface. ifinUcastPakts - Interface Inbound Unicast Packets The number of subnetwork-unicast packets delivered
to a higher-layer protocol. The number of non-unicast (i.e., subnetwork- broadcast
or subnetwork-multicast) packets The current operational state of the interface.
The length of the output packet queue (in packets) The total number of packets that higher-level
protocols requested be transmitted to a The total number of packets that higher-level
protocols requested be transmitted to a non- The average value of received packets discarded
per second during the polling interval The average value of transmitted packets in error
per second during the polling interval The average value of received packets in error
per second during the polling interval The average value of transmitted packets in error
per second during the polling interval The average value of broadcast packet received
per second during the polling interval The average value of broadacst packet transmitted
per second during the polling interval
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