SNMP info

1st very your server SNMP is working (check to see if you configured it correctly)

sudo /usr/bin/snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

If you don't get a response, then check your config. Below is an example of a basic config you can use as reference

com2sec notConfigUser default public

group notConfigGroup v1 notConfigUser
group notConfigGroup v2c notConfigUser

view systemview included system

access notConfigGroup "" any noauth exact systemview none none

syslocation Unknown (edit /etc/snmp/snmpd.conf)
syscontact Root (configure /etc/snmp/snmp.local.conf)

Here is a more locked down to your network version

com2sec local localhost public
com2sec mynetwork 192.168.0.0/24 public

group MyRWGroup v1 local
group MyRWGroup v2c local
group MyRWGroup usm local
group MyROGroup v1 mynetwork
group MyROGroup v2c mynetwork
group MyROGroup usm mynetwork

view all included .1              80

access MyROGroup "" any noauth exact all none none
access MyRWGroup "" any noauth exact all all none

syslocation Linux (RH3_UP2), Home Linux Router.
syscontact YourNameHere 

Once you make the necessary changes to your /etc/snmpd/snmpd.conf file go ahead and restart snmpd services

sudo /etc/init.d/snmpd restart