Sometimes you just need to test if SNMP settings and the network between devices works ok. Most of the normal SNMP software are too big to install on any server, and have a db, a service and a web front - in short, for just testing SNMP, are too much work.
To that end, I've found that this small exe is great at that. It's old... and thus very small. Just used on 2k8 r2 server today with no issues - just put ip and string and hit start.
http://www.wtcs.org/snmp4tpc/getif.htm
