Monday, March 2, 2009

Configuring Cisco Router as a DHCP Server


Thank GOD, atlast i have done it.....lolz. I was trying from last couple of days to configure cisco router as a DHCP server but there were some problems but anyway today i have done with that. Here is the step wise configuration of the Lab, may be it will help someone. so here we go!

Note: connect the devices as shown in the figure

The configuration on cisco router to be DHCP server as follow:

SERVER(config)# interface fasethernet 0/0
SERVER(config-if)# ip address 192.168.1.1 255.255.255.0
SERVER(config-if)# no shutdown
SERVER(config-if)# exit

SERVER(config)# ip dhcp excluded-address 192.168.1.1 192.168.1.99
SERVER(config)# ip dhcp pool mypool
SERVER(config)# network 192.168.1.0 255.255.255.0
SERVER(config)# default-router 192.168.1.1
SERVER(config)# dns-server 192.168.1.1


Now the configuration on the client side is just simple

CLIENT_1(config)# do show ip interface brief
CLIENT_1(config)#interface fastethernet 0/0
CLIENT_1(config-if)# ip address dhcp
CLIENT_1(config-if)# no shutdown


Now wait for the log message on console, if not seen don't worry after a while CLIENT_1 should obtained ip from DHCP Server.

CLIENT_1# show ip interface brief
CLIENT_1# ping 192.168.1.1


You can check the DHCP bindings by a command

CLIENT_1# show ip dhcp bindings

The output of my lab for this bindings command is as follow:
IP address Client-ID/ Lease expiration Type
Hardware address
192.168.1.100 0001.4303.C501 -- Automatic
192.168.1.101 0004.9A66.B101 -- Automatic
192.168.1.102 000A.41D2.1543 -- Automatic


The same commands are on CLIENT_2 as we did on CLIENT_1. For pc just check the option (ip configuration......DHCP).

Enjoy it!