Locating and Troubleshooting DHCP, TFTP, and DNS Services on the NonStop Dedicated Service LAN

How To Locate and Troubleshoot DHCP, TFTP, and DNS
Services
To ensure that your dedicated service LAN is in compliance with the “Rules for DHCP, TFTP, and
DNS Services” (page 4), this chapter describes how to locate, check the status of, and disable
(if necessary), those services:
• “On a NonStop System Console” (page 6)
• “On CLIMs” (page 10)
NOTE: If you know the current location, the two system consoles or two CLIMs on which these
services are located and wish to migrate or change that configuration, use the OSM CLIM Boot
Service Configuration Wizard (see “How to Migrate DHCP, TFTP, and DNS Services” (page 5));
the wizard not only enables those services on the target devices, but also disables those services
on the devices you are migrating from and copies the HSS files required for NonStop BladeSystems
and NonStop NS2200 series systems. The procedures that follow are useful when you do not
know the location of the services or want to ensure that you do not have more than two sources
of those services on your dedicated service LAN.
On a NonStop System Console
This section describes how to locate, check the status, and disable (if necessary) the DHCP, TFTP,
and DNS services installed on NonStop system consoles. The procedures in this section apply to
NonStop system consoles running Windows 2003 Server, which is required for all consoles
supporting NonStop BladeSystems, NonStop NS2200 series systems, or any NonStop NS-series
systems with CLIMs attached.
• “Checking DHCP Status on a NonStop System Console” (page 6)
• “Checking DNS Status on a NonStop System Console” (page 8)
• “Checking TFTP Status on a NonStop System Console” (page 9)
CAUTION: There should only be two NonStop system consoles connected to the dedicated service
LAN; additional consoles can cause conflicting IP addresses and, for NonStop BladeSystems and
NonStop NS2200 series systems, can make it difficult to manage the Halted State Services (HSS)
files needed to boot the processors blades in those systems. However, removing an existing console
from the LAN can also lead to boot problems, if that console happens to be the only location of
the HSS file for a particular NonStop BladeSystem or NonStop NS2200 series system. Removing
or replacing a NonStop system console should only be done by an authorized service provider.
Checking DHCP Status on a NonStop System Console
There are two ways to determine the location of active DHCP services on a dedicated service LAN:
• You can check the status of DHCP services on each individual system console, as described
in this section.
• You can issue a command on any CLIM on the LAN to show where DHCP services are
configured on the LAN – regardless of whether on CLIMs or system consoles – as described
in “Checking DHCP Status on a CLIM” (page 10)
To determine if DHCP service is installed and enabled on a system console running Windows
2003:
6 How To Locate and Troubleshoot DHCP, TFTP, and DNS Services