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Just a small, helpful tidbit:

If you ever see the following in your tcpdump while resolving SNMP issues (when isn’t SNMP having issues?):

It basically means that your iptables is blocking SNMP. This one has bit me on multiple occasions on boxes that were running iptables but should not have been. Either disable it or open up the port:

On RH-based distros:

or:

Of course, don’t go disabling iptables, when you can simple open up the port :). I would also recommend using SNMPv3 whenever possible since it allows for encryption and authentications.

Cheers,

😀