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

1. From the Windows Start menu, select Administrative Tools > Services.
2. Select Trivial FTP Daemon, then right-click and select Stop.
3. Right-click again on the Trivial FTP Daemon entry, select Properties, and change the Start value
from “Automatic” to “Manual.”
On CLIMs
This section describes how to locate, check the status, and disable (if necessary) the DHCP, TFTP,
and DNS services installed on CLuster I/O Modules (CLIMs). These services should never be running
on both NonStop system consoles and CLIMs on the same dedicated service LAN; for more
information, see “Rules for DHCP, TFTP, and DNS Services” (page 4).
NOTE: To alter the DHCP, DNS, and TFTP configuration for your LAN, you should use the OSM
CLIM Boot Service Configuration Wizard whenever possible (see “How to Migrate DHCP, TFTP,
and DNS Services” (page 5)). However, if you are not sure where all sources of those services
are on your LAN, there are TACL commands for:
• “Checking DHCP Status on a CLIM” (page 10)
• “Checking DNS Status on a CLIM” (page 11)
• “Checking TFTP Status on a CLIM” (page 12)
Checking DHCP Status on a CLIM
Unlike “On a NonStop System Console” (page 6), you can issue a command on one CLIM on
the LAN that will show where DHCP services are configured on the LAN regardless of whether on
CLIMs or system consoles. However, the discover command (described below) should be run
multiple times – 5 is recommended – and on different CLIMs, if possible, to confirm that there are
not more than two sources of DHCP services on the LAN. Some DHCP servers do not respond to
the DHCP request when another server has already responded to the request.
The TACL command to discover where DHCP services are located on a LAN is:
climcmd clim-name climdnsconfig server -discover
The -discover option lists all DHCP servers (although the command should be repeated, as
suggested above, to ensure that you locate all DHCP servers) on the LAN.
To check the status of the DHCP service on a particular CLIM, issue the following TACL command
from any CLIM on the LAN on which DHCP/DNS services are running:
climcmd clim-name climdhcpmgr status
This command also shows the lease range for the server and the IP address of the corresponding
DNS servers.
10 How To Locate and Troubleshoot DHCP, TFTP, and DNS Services