y Title[localhost.3]: petulance.blackhelicopters.org: xl0 z PageTop[localhost.3]:

Traffic Analysis for xl0

System:	petulance.blackhelicopters.org in Basement Server Room
Maintainer:	mwlucas@blackhelicopters.org>
Interface:	xl0 (3)
IP:	petulance.blackhelicopters.org (192.168.1.100)
Max Speed:	1250.0 kBytes/s (ethernetCsmacd)

………………………………………………………………………………………. Labels The string inside the square brackets ([ ])(w) is an arbitrary label that indicates a unique subsystem being monitored. In this example, the label is localhost.3. This might be a network interface, the disk space on a partition, CPU usage, or anything. All files generated by MRTG for this monitored subsystem will have a name starting with this label. To monitor any number of items, you must give each a unique label of any length. I usually create labels like “webserver1.EthernetTraffic” or “webserver9.AvailableSwap.” Labels with names similar to the MIB you want to monitor are most useful, but they can become quite long, so strike a balance that you feel comfortable with. Target The Target keyword (v) tells MRTG which machine to query and which interface on that machine this configuration is for. (The actual target appears after the colon.) If you change the community name or IP address of your system, you can edit it directly here. In this case, the target is 3:GetLostLoser localhost: an interface number, a SNMP community, and a hostname. We spoke about indexes in MIBs earlier in “Index Numbers;” if you were to snmpwalk the MIB tree, you would find that this interface has the index number 3. You can dig through the snmpwalk output to find out which interface has this index number. Each interface has a unique IP address, however, and it’s generally easier to use that to identify the interface. MRTG kindly includes the IP address a little later in the configuration. MaxBytes MaxBytes (x) is the maximum value allowed for this item. Since this is a network interface, MaxBytes is the maximum number of bytes this network card can handle (a 10BaseT card). MRTG has enough brains to figure out the MaxBytes values for most common network types. You should never have to change this value if you’re measuring throughput. You will have to change it to monitor other things, such as CPU or memory utilization. Title and PageTop Title (y) and PageTop (z) are arbitrary HTML. You can put almost any HTML in these spaces to display it on the generated MRTG Web page. 443

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