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How to fix MAC Address with IP Address on DHCP server. December 9, 2009

Posted by jbanju in LINUX CentOS.
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1. Get a MAC Address from Client’s laptop such as  A1:B2:C3:A1:B2:C3

2. Add the MAC Address into the file /etc/dhcpd.conf such as

ddns-update-style interim
ignore client-updates
 
subnet 192.168.1.0 netmask 255.255.255.0 {
 
   # The range of IP addresses the server
   # will issue to DHCP enabled PC clients
   # booting up on the network
 
   range 192.168.1.201 192.168.1.220
 
   # Set the amount of time in seconds that
   # a client may keep the IP address
 
   default-lease-time 86400
   max-lease-time 86400
 
   # Set the default gateway to be used by
   # the PC clients
 
   option routers 192.168.1.1
   # Don't forward DHCP requests from this
   # NIC interface to any other NIC
   # interfaces
 
   option ip-forwarding off
 
   # Set the broadcast address and subnet mask
   # to be used by the DHCP clients
 
   option broadcast-address 192.168.1.255
   option subnet-mask 255.255.255.0
 
   # Set the NTP server to be used by the
   # DHCP clients
 
   option ntp-servers 192.168.1.100
 
   # Set the DNS server to be used by the
   # DHCP clients
 
   option domain-name-servers 192.168.1.100
 
   # If you specify a WINS server for your Windows clients,
   # you need to include the following option in the dhcpd.conf file:
 
   option netbios-name-servers 192.168.1.100
 
   # You can also assign specific IP addresses based on the clients'
   # ethernet MAC address as follows (Host's name is "laser-printer":
 
   host user-one {
      hardware ethernet A1:B2:C3:A1:B2:C3
      fixed-address 192.168.1.222
   }
}
#
# List an unused interface here
#
subnet 192.168.2.0 netmask 255.255.255.0 {
}

3. Check your configuration file is correct :

# /usr/sbin/dhcpd -t -cf /etc/dhcpd.conf

4. Restart your DHCP Service :

# service dhcpd restart

5. Set DHCP relay in your CISCO switch points to your DHCP Server (Assume your IP Address of DHCP Server is 192.168.1.201)

$ conf t
$ conf t > interface vlan 10
$ conf t > ip address 192.168.1.1 255.255.255.0
$ conf t > no ip directed-broadcast
$ conf t > ip helper-address 192.168.1.201
$ conf t > end

6. You can check all IP Addresses which receive from DHCP Server in file /var/lib/dhcp/dhcpd.leases

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