Sometimes, snmpd will report the wrong speed of a network interface. For example, the following output shows a speed of 10Mbps, whereas the ethernet port on the server is actually working at 100Mbps:

    IF-MIB::ifIndex.2 = INTEGER: 2
    IF-MIB::ifDescr.2 = STRING: eth0
    IF-MIB::ifType.2 = INTEGER: ethernetCsmacd(6)
    IF-MIB::ifMtu.2 = INTEGER: 1500
    IF-MIB::ifSpeed.2 = Gauge32: 10000000

The Net-SNMP documentation mentions this. This can be manually fixed with the interface directive in snmpd.conf, for example:

    interface eth0 6 100000000