Install and configure DHCP on a blue dot Linux system

The Blue Dot Linux 1.0 includes a DHCP package that can be used to provide DHCP. When the user installs the Blue Dot Linux, it installs automatically. In most cases, Linux acts as a DHCP server and Windows 95/98 acts as a DHCP client. Linux can also be a DHCP client, linux ipv6 dhcp client  but users will install the DHCPCD RPM package. Linux as a DHCP server, only need to install DHCPD RPM package (take Bluepoint Linux as an example)

A Prerequisites for a DHCP server to work:linux gui dhcp server

In order for the DHCP server to serve the Windows machine, you may need to create a route to address 255.255.255.255, plus this routing command to/etc/rc.d/rc.local so that it runs automatically after each boot.

 #route add -host 255.255.255.255 dev eth0

If you report an error message:linux dhcp server configuration pdf

255.255.255.255： Unkown host

Try adding in the/etc/hosts file: linux enable dhcp command line

255.255.255.255 dhcp, then try:linux interfaces dhcp
  #route add -host dhcp dev eth0

Two DHCPD configuration file/etc/dhcpd.conf

The configuration file for the DHCPD daemon/etc/dhcpd.conf is the following is an example of a DHCP configuration file:

 default-lease-time 1200；
  max-lease-time 9200；
  option subnet-mask 255.255.255.0；
  option broadcast-address 192.168.0.255；
  option routers 192.168.0.254；
  option domain-name-servers 192.168.0.1,192.168.0.2；
  option domain-name “openunix.org”；
  subnet 192.168.0.0 netmask 255.255.255.0 {
  range 192.168.0.10 192.168.0.100；
  range 192.168.0.150 192.168.0.200；
  }

This allows the DHCP server to assign two segments of the address range to the customer 192.168.0.10-100 or 192.168.0.150-200. The maximum allowable lease time is 9,200 seconds if the client does not continue to request a DHCP address and then releases the IP address after 1200 seconds.

The server sends the following parameter to the DHCP client: using 255.255.255.0 as the subnet mask, using 192.168.0.255 as the broadcast address, and 192.168.0.222 as the default gateway, using the 192.168.0.1 and 192.168.0.2 as a DNS server. If you are assigning a WINS server to a Windows customer, you will need to include the following options in the dhcpd.conf file:

option netbios-name-servers 192.168.0.1;

Third, use DHCP to assign fixed addresses

Generally speaking, DHCP is assigned a dynamic IP address, if the user needs static IP 10, it can also specify a fixed IP address for a block of cards, whenever this network card will always obtain a fixed IP address from the DHCP server: Add the following statement to the/etc/dhcpd.conf:

 host jimmy {
  hardware ethernet 08:00:2b:4c:59:23；
  fixed-address 192.168.1.222：
  }

The contents of the above can be written in one line:

host jupiter {hardware ethernet 00:a0:c9:a6:96:33;
fixed-address 192.168.1.12；}

As in allocating dynamic addresses, users can also specify a different gateway address for a machine, such as the name of the server, such as:

host vienus{hardware ethernet 00:a0:c9:a6:96:33；
fixed-address 192.168.1.12：option routers 192.168.11.5；}

Iv. Create a file dhcpd.leases

In most cases, the installation of DHCP does not create a DHCPD.LEASESDHCP server before you must create an empty file dhcpd.leases

 #touch /var/run/dhcp/dhcpd.leases

To start the DHCP server, simply enter/ETC/RC.D/INIT.D/DHCP start. Or use the NTSYSV setting to start the DHCP service automatically when the system starts.