Setup Guide

Set DHCP lease time

If you use DHCP (Dynamic Host Configuration Protocol) in your network, set the IP address lease time to at least 7 days and turn on SNMP management on the DHCP servers.

About community strings

A community string is like a password. A device uses a community string to protect its SNMP MIB—and it’s the data from the SNMP MIB that Network Discovery relies on. Network Discovery must know at least one of a device’s passwords to collect data from that device. If you do not give Network Discovery a device’s community string, Network Discovery will behave as though the device does not have SNMP management turned on. Network Discovery will appear to work, but you’ll eventually notice that it is working poorly. Once Network Discovery is up and running, the Exceptions reports can advise you of problems.

Note: Community strings are case-sensitive. “Public” and “public” are two different strings.

Directed community strings

Directed community strings give devices another layer of protection: a list of IP addresses of approved devices. When Network Discovery tries to get information from a device with a directed community string, the device asks not only “What’s the password?” but also “Are you on the list?”

Give the Peregrine appliance IP address to all devices using directed community strings

When directed community strings are used, it is not enough to give Network Discovery access to the device. You must also configure the device to recognize the Peregrine appliance. You must put it on the list of approved devices.

Set DHCP lease time 25

Page 25
Image 25
Dell DPND-523-EN12 manual Set Dhcp lease time, About community strings