[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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dhcp

dhcp(5) 						Standards, Environments, and Macros						   dhcp(5)

NAME

       dhcp - Dynamic Host Configuration Protocol

DESCRIPTION

       Dynamic	Host Configuration Protocol (DHCP) enables host systems in a TCP/IP network to be configured automatically for the network as they
       boot. DHCP uses a client/server mechanism: servers store configuration information  for	clients,  and  provide	that  information  upon  a
       client's request. The information can include the client's IP address and information about network services available to the client.

       This manual page provides a brief summary of the Solaris DHCP implementation.

   Solaris DHCP Client
       The  Solaris  DHCP  client  is implemented as background daemon, dhcpagent(1M). This daemon is started automatically during bootup if there
       exists at least one dhcp.interface file in /etc. Only interfaces with a corresponding /etc/dhcp.interface file are automatically configured
       during  boot.  Network  parameters  needed for system configuration during bootup are extracted from the information recieved by the daemon
       through the use of the dhcpinfo(1) command. The daemon's default behavior can be altered by changing the tunables in the  /etc/default/dhc-
       pagent  file.  The  daemon is controlled by the ifconfig(1M) utility. Check the status of the daemon using the netstat(1M) and ifconfig(1M)
       commands.

   Solaris DHCP Server
       The Solaris DHCP server is implemented as a background daemon, in.dhcpd(1M). This daemon can deliver network configuration  information	to
       either  BOOTP  or  DHCP	clients.  The Solaris DHCP service can be managed using the dhcpmgr(1M) GUI or the command line utilities dhcpcon-
       fig(1M), dhtadm(1M), and pntadm(1M).

   DHCP Configuration Tables
       The Solaris DHCP server stores client configuration information in the following two types of tables:

       dhcptab tables	       Contain macros and options (also known as symbols), used to construct a package	of  configuration  information	to
			       send to each DHCP client. There exists only one dhcptab for the DHCP service. The dhcptab(4) can be viewed and mod-
			       ified using the dhtadm(1M) command or dhcpmgr(1M) graphical utility. See dhcptab(4) for more information about  the
			       syntax of dhcptab records. See dhcp_inittab(4) for more information about the DHCP options and symbols.

       DHCP network tables     DHCP  network  tables,  which  contain  mappings of client IDs to IP addresses and parameters associated with those
			       addresses. Network tables are named with the IP address of the network, and can be created,  viewed,  and  modified
			       using  the  pntadm  command  or	dhcpmgr  graphical utility. See dhcp_network(4) for more information about network
			       tables.

SEE ALSO

       dhcpinfo(1), dhcpagent(1M), dhcpconfig(1M), dhcpmgr(1M),  dhtadm(1M),  ifconfig(1M),  in.dhcpd(1M),  netstat(1M),  pntadm(1M),  syslog(3C),
       dhcp_network(4), dhcptab(4), dhcpsvc.conf(4), dhcp_inittab(4), dhcp_modules(5)

       Solaris DHCP Service Developer's Guide

       Alexander, S., and R. Droms. RFC 2132, DHCP Options and BOOTP Vendor Extensions.  Silicon Graphics, Inc. Bucknell University. March 1997.

       Droms, R. RFC 1534, Interoperation Between DHCP and BOOTP. Bucknell University. October 1993.

       Droms, R. RFC 2131, Dynamic Host Configuration  Protocol. Bucknell University. March 1997.

       Wimer, W. RFC 1542, Clarifications and Extensions for the Bootstrap Protocol. Carnegie Mellon University. October 1993.

SunOS 5.10							    13 Mar 2001 							   dhcp(5)