………………………………………………………………………………………. Network Traffic Just for completeness, let’s look at a sample of how to measure network traffic. This assumes a 10Mbps network connection; if you’re using 100BaseT, multiply MaxBytes by 10. ………………………………………………………………………………………. Title[myhost.AbsoluteBSD.com.traffic]: myhost.AbsoluteBSD.com network traffic MaxBytes[myhost.AbsoluteBSD.com.traffic]: 125000 WithPeak[myhost.AbsoluteBSD.com.traffic]: wmy Target[myhost.AbsoluteBSD.com.traffic]: public@myhost.AbsoluteBSD.com Options[myhost.AbsoluteBSD.com.traffic]: growright, bits PageTop[myhost.AbsoluteBSD.com.traffic]:

Network traffic on myhost.AbsoluteBSD.com

………………………………………………………………………………………. Monitoring Non-BSD Systems MRTG can monitor any system that uses SNMP; it is a standard spoken by almost every network-equipment and operating-system vendor. To do so, all you need is the list of MIBs that the product supports and what they mean. Tables of MIB interpretations simple text files containing tables of how to read the vendor’s MIB tree are generally available from vendors. Each file starts something like this: ………………………………………………………………………………………. IPV6-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, mib-2, Counter32, Unsigned32, Integer32, Gauge32 FROM SNMPv2-SMI DisplayString, PhysAddress, TruthValue, TimeStamp, VariablePointer, RowPointer FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF Ipv6IfIndex, Ipv6Address, Ipv6AddressPrefix, Ipv6AddressIfIdentifier, Ipv6IfIndexOrZero FROM IPV6-TC; ………………………………………………………………………………………. Copy these definition files to a directory on your system. Next, set the environment variable MIBDIRS to point to that directory, and snmptranslate will recognize them. You can even install SNMP on your NT systems; this makes them easy to monitor, at a fraction of the cost of commercial systems. The only difference between MRTG and a commercial system is that you must know what you’re doing to use MRTG. I highly recommend Garth Williams “SNMP for the Public Community” site (http://www.wtcs.org/snmp4tpc/) for SNMP on other platforms. Be warned in advance: To call Microsoft’s implementation of SNMP “skeletal” would leave you without an adequate description of its error messages. Windows 2000 and XP are better than NT, but not 450

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