Monitoring your network devices is considered a no-brainer. You HAVE to do it to manage your IT infrastructure effectively. One of the simplest methods is by using SNMP together with tools like Cacti, PRTG, etc (and of course the company I work for’s SINTelligent).

I’ll discuss configuring SNMP on Linux and Windows in future posts if I can, but for now, let’s focus on Cisco devices. More specifically, the bare minimum to get your Router/Switch ready for basic monitoring:
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By default, when you install snmpd (this was tested on Ubuntu 10.04, not sure about other Linux variants), the daemon is set to listen only on 127.0.0.1 (localhost)

If you run chech the process, you can see this:

techedemic@demo:/etc/default$ ps awux | grep snmp
snmp     32753  0.3  2.0  47916  4948 ?        S    09:29   0:00 /usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid 127.0.0.1
sintrex  32757  0.0  0.3   7624   904 pts/0    S+   09:29   0:00 grep --color=auto snmp

To allow access to any machine from outside (make sure your company security policies allow for this), you need to edit the /etc/default/snmpd file as follows:

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