How to Set up a DHCP server in Linux

Article Title: how to set up a DHCP server in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems and open source, and other basic categories 1. OS version
　
[Root @ server ~] # More/etc/redhat-release
　
Red Hat Enterprise Linux AS release 4 (Nahant Update 4)
　
2. Check whether the DHCP server software has been installed in the system.
　
[Root @ server ~] # Rpm-qa | grep dhcp
　
Dhcpv6_client-0.10-14_EL4
　
3. mount the disc and install the DHCP server software.
　
[Root @ server ~] # Mount/media/cdrom
　
Mount: block device/dev/hdc is write-protected, mounting read-only
　
[Root @ server RPMS] # find/media/cdrom-name "dhcp *"
　
/Media/cdrom/RedHat/RPMS/dhcpv6-0.10-14_EL4.i386.rpm
　
/Media/cdrom/RedHat/RPMS/dhcpv6_client-0.10-14_EL4.i386.rpm
　
/Media/cdrom/RedHat/RPMS/dhcp-3.0.1-58.EL4.i386.rpm
　
/Media/cdrom/RedHat/RPMS/dhcp-devel-3.0.1-58.EL4.i386.rpm
　
[Root @ server RPMS] # rpm-ivh/media/cdrom/RedHat/RPMS/dhcp-3.0.1-58.EL4.i386.rpm
　
[Root @ server RPMS] # rpm-qa | grep dhcp
　
Dhcp-3.0.1-58.EL4
　
Dhcpv6_client-0.10-14_EL4
　
The installation has been successful, haha
　
4. Check the files.
　
[Root @ server RPMS] # rpm-ql grep dhcp
　
......
　
/Etc/dhcpd. conf -- dhcp configuration file
　
/Etc/rc. d/init. d/dhcpd
　
/Etc/rc. d/init. d/dhcrelay
　
/Etc/sysconfig/dhcpd
　
/Etc/sysconfig/dhcrelay
　
/Usr/bin/omshell
　
/Usr/sbin/dhcpd
　
/Usr/sbin/dhcrelay
　
/Usr/share/doc/dhcp-3.0.1
　
/Usr/share/doc/dhcp-3.0.1/README
　
/Usr/share/doc/dhcp-3.0.1/RELNOTES
　
/Usr/share/doc/dhcp-3.0.1/dhcpd. conf. sample -- template of the dhcp configuration file
　
/Usr/share/man/man1/omshell.1.gz
　
/Usr/share/man/man5/dhcp-eval.5.gz
　
/Usr/share/man/man5/dhcpd.conf.5.gz
　
/Usr/share/man/man5/dhcpd.leases.5.gz
　
/Usr/share/man/man8/dhcpd.8.gz
　
/Usr/share/man/man8/dhcrelay.8.gz
　
/Var/lib/dhcp
　
/Var/lib/dhcp/dhcpd. leases -- the log file for IP allocation
　
5. [root @ server RPMS] # more/etc/dhcpd. conf
　
Is there anything here? COPY the template file.
　
[Root @ server RPMS] # cp/usr/share/doc/dhcp-3.0.1/dhcpd. conf. sample/etc/dhcpd. conf
　
6. view the configuration file and change it as required.
　
[Root @ server RPMS] # more/etc/dhcpd. conf
　
Ddns-update-style interim;
　
Ignore client-updates;
　
Subnet 192.168.0.0 netmask 255.255.255.0 {
　
# -- Default gateway
　
Option routers 192.168.0.1;
　
Option subnet-mask limit 255.0;
　
# Option nis-domain "domain.org ";
　
Option domain-name "wiscom.com.cn ";
　
Option domain-name-servers 219.141.136.10, 211.147.6.3;
　
Option time-offset-18000; # Eastern Standard Time
　
# Option ntp-servers 192.168.1.1;
　
# Option netbios-name-servers 192.168.1.1;
　
# -- Selects point-to-point node (default is hybrid ). Don't change this unless
　
# -- You understand Netbios very well
　
# Option netbios-node-type 2;
　
Range dynamic-bootp 192.168.0.128 192.168.0.254;
　
Default-lease-time 21600;
　
Max-lease-time 43200;
　
# We want the nameserver to appear at a fixed address
　
Host ns {
　
Next-server marvin.redhat.com;
　
Hardware ethernet 12: 34: 56: 78: AB: CD;
　
Fixed-address 207.175.42.254;
　
}
　
}
　
It is already clear that all configurations of this configuration have been configured.
　
7. Start the DHCP server.
　
[Root @ server RPMS] # service dhcpd start
　
Starting dhcpd: [OK]
　
8. Check the log to see if there are any errors.
　
[Root @ server RPMS] # tail-20/var/log/messages
　
Dec 9 18:05:19 server dhcpd: Wrote 0 deleted host decls to leases file.
　
Dec 9 18:05:19 server dhcpd: Wrote 0 new dynamic host decls to leases file.
　
Dec 9 18:05:19 server dhcpd: Wrote 0 leases to leases file.
　
Dec 9 18:05:19 server dhcpd: Internet Systems Consortium DHCP Server V3.0.1
　
Dec 9 18:05:19 server dhcpd:
　
Dec 9 18:05:19 server dhcpd: Copyright 2004 Internet Systems Consortium.
　
Dec 9 18:05:19 server dhcpd: All rights reserved.
　
Dec 9 18:05:19 server dhcpd: For info, please visit http://www.isc.org/sw/dhcp/
　
Dec 9 18:05:19 server dhcpd: Wrote 0 deleted host decls to leases file.
　
Dec 9 18:05:19 server dhcpd: Wrote 0 new dynamic host decls to leases file.
　
Dec 9 18:05:19 server dhcpd: Listening on LPF/eth0/00: 0c: 29: c5: 06: fc/192.168.0/24
　
Dec 9 18:05:19 server dhcpd: Wrote 0 leases to leases file.
　
Dec 9 18:05:19 server dhcpd: Listening on LPF/eth0/00: 0c: 29: c5: 06: fc/192.168.0/24
　
Dec 9 18:05:19 server dhcpd: Sending on LPF/eth0/00: 0c: 29: c5: 06: fc/192.168.0/24
　
Dec 9 18:05:19 server dhcpd: Sending on LPF/eth0/00: 0c: 29: c5: 06: fc/192.168.0/24
　
Dec 9 18:05:19 server dhcpd:
　
Dec 9 18:05:19 server dhcpd: Sending on Socket/fallback-net
　
Dec 9 18:05:19 server dhcpd: Sending on Socket/fallback-net
　
Dec 9 18:05:19 server dhcpd:
　
Dec 9 18:05:20 server dhcpd: dhcpd startup succeeded