Some useful SNMP MIB strings for network and server monitoring.
(for more MIB strings check files from /usr/local/share/snmp/mibs)

To get values using SNMP:
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snmpget -v 2c -c public -Oqv localhost IF-MIB::ifPhysAddress.1

(IF-MIB:ifPhysAddress is SNMP string that gets MAC (hardware) address of your network interface (1 for first NIC, 2 for second, and so on).


SNMP Strings:
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IF-MIB::ifPhysAddress.1
hardware address of you network interface

UCD-SNMP-MIB::laLoadInt.1
1, 5 and 15 minute load averages for your system, multiplied by 100 to make them integers

UCD-SNMP-MIB::memAvailReal.0
amount of free physical memory in your system

HOST-RESOURCES-MIB::hrSystemProcesses.0
number of processes currently running on this system