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How to configure DHCP in cisco router using packet tracer simulator,


Step 1:Create a topology like this,

How to Configure DHCP in Cisco Router Using Packet Tracer and Gns3





Step 2:Configure router interface fastethernet0/0 and fastethernet

1/0 with ip address.

R1#config t
R1(config)#interface fastethernet 0/0
R1(config-if)#ip address 10.0.0.1 255.0.0.0
R1(config-if)#no shutdown


R1(config-if)#exit
R1(config)#interface fastethernet 1/0
R1(config-if)#ip address 20.0.0.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit

Step 3:Configure DHCP pool for the network 10 and 20,

In Router R1,Global Configuration mode,


R1(config)#service dhcp

This command is to enable the dhcp server on a router. Routers in packet tracer won't accept this command.By default dhcp will be running on router so skip 'service dhcp' command if you are configuring dhcp in packet tracer,just create a network pool for the network it will work.Use this in real time or other simulators like gns3.


R1(config)#ip dhcp pool 10network         "where '10network' is the pool name we can use what ever we
want.This command get us into the DHCP Configuration mode."

R1(dhcp-config)#network 10.0.0.0 255.0.0.0        "It defines the network range to be leased"

R1(dhcp-config)#dns-server 10.0.0.2       "Ip address for the dns server."

R1(dhcp-config)#default-router 10.0.0.1       "Default gateway for this network."

R1(dhcp-config)#exit


DHCP pool for 10 Network

R1(config)#ip dhcp pool 10network
R1(dhcp-config)#network 10.0.0.0 255.0.0.0
R1(dhcp-config)#dns-server 10.0.0.2
R1(dhcp-config)#default-router 10.0.0.1
R1(dhcp-config)#exit

DHCP pool for 20 Network

R1(config)#ip dhcp pool 20network
R1(dhcp-config)#network 20.0.0.0 255.0.0.0
R1(dhcp-config)#dns-server 10.0.0.2
R1(dhcp-config)#default-router 20.0.0.1
R1(dhcp-config)#exit



Now, Click on any of the PC->Desktop->ip configuration->Choose DHCP.Now PC will get an ip from DHCP server.




How to Configure DHCP in Cisco Router Using Packet Tracer and Gns3







Few more command We can use, but we can't configure this in packet tracer.Use gns3 simulator for this.


R1(dhcp-config)#netbios-server x.x.x.x 'where x.x.x.x is ip address of netbios server.

R1(dhcp-config)#lease x   'where X is the number it sets the lease time,by default 1 (i.e. one day).

R1(dhcp-config)#ip dhcp excluded address x.x.x.x x.x.x.x   'Range of ip address excluded from the pool it will not be leased to the clients'.

R1(dhcp-config)#ip dhcp excluded address x.x.x.x    'To exclude only one ip address from the range of ip address'.


Ex.

R1(dhcp-config)#netbios-server 10.0.0.2
R1(dhcp-config)#lease 2
R1(dhcp-config)#ip dhcp excluded address 10.0.0.1 10.0.0.10
R1(dhcp-config)#ip dhcp excluded address 10.0.0.35







Trouble shooting commands,






Router#show ip dhcp binding    'Displays a list of all bindings created.'


Router#show ip dhcp binding w.x.y.z     'Displays the bindings for a specific DHCP client with an IP address of w.x.y.z.'


Router#clear ip dhcp binding a.b.c.d      'Clears an automatic address binding from the DHCP server database.'


Router#clear ip dhcp binding *      'Clears all automatic DHCP bindings.'


Router#show ip dhcp conflict      'Displays a list of all address conflicts recorded by the DHCP server.'


Router#clear ip dhcp conflict a.b.c.d     'Clears address conflict from the database.'


Router#clear ip dhcp conflict *      'Clears conflicts for all addresses.'


Router#show ip dhcp database      'Displays recent activity on the DHCP database.'


Router#show ip dhcp server statistics      'Displays a list of the number of messages sent and received by the DHCP server.'


Router#clear ip dhcp server statistics






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