By default Net-SNMP does not publish the full SNMP tree. Check to see if that is currently the case on a device and configure it correctly.
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Confirm snmpd is running:
> snmpwalk -v1 -cpublic <your device name> system
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Retrieve the IP table for the device with snmpwalk:
> snmpwalk -v1 -cpublic <your device name> ip
Typical SNMP View:
view systemview included .1 view systemview included .1.3.6.1.2.1.25.1 access notConfigGroup "" any noauth exact systemview none none