DHCP Service

The Dynamic Host Configuration Protocol (DHCP) provides a way to automate and manage the network configurations of all ORBIT attached devices. It has two main functions:

1.) Assigning networking (IP) configuration 2.) Support for PXE booting

Configuration

authoritative;
use-host-decl-names on;
ping-check false;
ping-timeout 0;
default-lease-time 86400;
max-lease-time 86400;

subnet 10.11.0.0 netmask 255.255.0.0 {
        range  10.11.50.100 10.11.50.255;
        option routers 10.11.0.1;
        option domain-name-servers 10.0.0.9;
        option domain-name "sb1.orbit-lab.org";
        option log-servers 10.11.0.10;
        option ntp-servers 10.11.0.10;
        ddns-updates off;
        ddns-domainname "sb1.orbit-lab.org";
        next-server 10.11.0.40;

        host consolec.sb1.orbit-lab.org {hardware ethernet 00:40:63:D4:09:62; fixed-address consolec.sb1.orbit-lab.org;}
        host repository2.sb1.orbit-lab.org {hardware ethernet 00:04:23:9E:DF:58; fixed-address repository2.sb1.orbit-lab.org;}
        host node1-1.sb1.orbit-lab.org {hardware ethernet 00:0f:ea:4A:8B:5F; fixed-address node1-1.sb1.orbit-lab.org;}
        host node1-2.sb1.orbit-lab.org {hardware ethernet 00:0F:EA:84:C8:01; fixed-address node1-2.sb1.orbit-lab.org;}
}

PXE Support

The PXE protocol uses a very complex set of extensions to DHCP and/or BOOTP but most of the newer implementations seem to be able to boot with standard DHCP configuration.

A DHCP configuration for PXE support is:

        allow booting;
        allow bootp;

	# Standard DHCP configuration directives...

	# Needed for PXE
	filename "/pxelinux.bin";
        option option-150 code 150 = text;
          
        # tftp server
        next-server 10.11.0.40;

Configuration As of 10/14/2015

• Main file is dhcpd.conf, includes each orbit subnet as separate file, e.g. include "/etc/dhcp/grid.conf";
• dhcpd Header is as follows

  #ddns-update-style interim;
  authoritative;
  use-host-decl-names on;
  get-lease-hostnames true;
  ping-check false;
  ping-timeout 0;
  log-facility local7;
  default-lease-time 86400;
  max-lease-time 86400;
  ddns-updates off;
  #allow booting;
  #allow bootp;
  # Ivan/James  on dhcp1 if you want the log to do dhcplog enable this below and modify syslog.conf  
  
  option ntp-servers dhcp1.orbit-lab.org,dhcp2.orbit-lab.org;
  
  filename "/pxelinux.bin";
  option option-150 code 150 = text;
  

• Header for each sandbox is:

  #Sandbox Config
  subnet 10.11.0.0 netmask 255.255.0.0 {
  	option routers 10.11.0.1; # Router
  	option domain-name-servers 10.11.0.9, 10.11.0.8; #DNS
  	option domain-name "sb1.orbit-lab.org"; #current domain
          option log-servers 10.11.0.10; # log set per subnet
          option ntp-servers 10.11.0.10; #ntp set per subnet
  	ddns-updates off; #no ddns
  	ddns-domainname "sb1.orbit-lab.org";
  	next-server 10.11.0.42; #for pxe
  

• Files included are:
  • inside.conf
  • instrument.conf
  • network.conf
  • cm.conf
  • dmz.conf
  • grid.conf
  • outdoor.conf
  • failover.conf
  • sandbox1.conf
  • sandbox2.conf
  • sandbox3.conf
  • sandbox4.conf
  • sandbox5.conf
  • sandbox6.conf
  • sandbox7.conf
  • sandbox8.conf
  • sandbox9.conf
  • aruba.conf