Installing snmpd on Ubuntu 8.04LTS for cacti

To install it type:

sudo apt-get install snmpd

Edit file /etc/default/snmpd and make sure those values are set:

SNMPDRUN=yes
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid 127.0.0.1'

If you want your server to listen on all interfaces, remove the 127.0.0.1 bit.

Edit /etc/snmp/snmpd.conf and change com2sec so that you have a private community

com2sec readonly default mycommunity

If you want a remote machine to be able to gather information for the community mycommunity, make sure you replace localhost by mynetwork, where mynetwork can be of the form: 1.1.1.1 or 1.1.0.0/16.

We are going to use the snmpwalk utility to verify that the server is working as wanted.

Here we want snmp to reply only to localhost for the community mycommunity.

From localhost

snmpwalk -Os -c mycommunity -v 1 localhost system

Should return a lot of output and:

snmpwalk -Os -c public -v 1 localhost system
Timeout: No Response from localhost

If the second command returns result, it might be because you did not comment the line starting with com2sec.

If you have a firewall running, you need to open UDP port 161 to allow external connections