[Tip] Using DHCP for Managed Systems Service Processors Post: 302900530

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Operating Systems AIX [Tip] Using DHCP for Managed Systems Service Processors Post 302900530 by bakunin on Wednesday 7th of May 2014 09:34:47 AM

05-07-2014

Registered User

[Tip] Using DHCP for Managed Systems Service Processors

This is a warning because we just went through searching for the error for some weeks.

In many cases the managed systems (respectively their service processors) reside on their own network, together with the HMC(s) managing them. In this setup usually the HMC acts as DHCP server for the service processors.

In our environment, though, this was not the case. We used our central DHCP server to give out IP addresses to the service processors. This worked - initially. After some time we started to experience duplicate IP addresses in the net and these were the ones given to the service processors, which in turn made the managed systems unavailable for the HMC.

We found out the following: the service processors are indeed DHCP-clients of sorts, but they do not fully adhere to the standards. In particular they do not renew their lease once it expires but simply pretend that the IP is theirs forever. The HMCs DHCP server process seems to know that and does not give out the IP address again even though - in terms of "real" DHCP - the address is not taken any more. Our standard DHCP-server, alas, did not know this and gave out the addresses to other systems. This was why we found duplicate IP adresses in the net. The service processors simply hadn't bothered to renew their IP leases and subsequently the DHCP server has reassigned them to other hosts.

Solution was to switch back to the HMC as DHCP server for managed systems with its own reserved address range and rediscovering the MSes on the HMC.

I hope this helps.

bakunin

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LEARN ABOUT OPENDARWIN

dhcpmgr

dhcpmgr(1M)						  System Administration Commands					       dhcpmgr(1M)

NAME

       dhcpmgr - graphical interface for managing DHCP service

SYNOPSIS

       /usr/sadm/admin/bin/dhcpmgr

DESCRIPTION

       dhcpmgr	is a graphical user interface which enables you to manage the Dynamic Host Configuration Protocol (DHCP) service on the local sys-
       tem. It performs the functions of the dhcpconfig, dhtadm, and pntadm command line utilities. You must be root to use dhcpmgr.  The  dhcpmgr
       Help, available from the Help menu, contains detailed information about using the tool.

USAGE

       You can perform the following tasks using dhcpmgr:

       Configure DHCP service

	   Use dhcpmgr to configure the DHCP daemon as a DHCP server, and select the data store to use for storing network configuration tables..

       Configure BOOTP relay service

	   Use dhcpmgr to configure the DHCP daemon as a BOOTP relay.

       Manage DHCP or BOOTP relay service

	   Use dhcpmgr to start, stop, enable, disable or unconfigure the DHCP service or BOOTP relay service, or change DHCP server parameters.

       Manage DHCP addresses

	   Use dhcpmgr to add, modify, or delete IP addresses leased by the DHCP service.

       Manage DHCP macros

	   Use dhcpmgr to add, modify or delete macros used to supply configuration parameters to DHCP clients.

       Manage DHCP options

	   Use dhcpmgr to add, modify or delete options used to define parameters deliverable through DHCP.

       Convert to a new DHCP data store

	   Use	dhcpmgr  to  configure the DHCP server to use a different data store, and convert the DHCP data to the format used by the new data
	   store.

       Move DHCP data to another server

	   Use dhcpmgr to export data from one Solaris DHCP server and import data onto another Solaris DHCP server.

EXIT STATUS

       The following exit values are returned:

       0	       Successful completion.

       non-zero        An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdhcm			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       dhcpconfig(1M), dhtadm(1M), pntadm(1M), in.dhcpd(1M), dhcpsvc.conf(4), dhcp_network(4), dhcptab(4), attributes(5), dhcp(5), dhcp_modules(5)

       Solaris DHCP Service Developer's Guide

       System Administration Guide: IP Services

SunOS 5.10							    13 Mar 2001 						       dhcpmgr(1M)