This is what I have done in my GNS3
- R3 - Router
- R4 - Switch
I have installed GNS3 and trying to enable on Router as mentioned above depict.
How to enabled DHCP on Cisco router R3 ?
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3 Answers
Move to configuration mode by typing this (you exclude address that you don't want the DHCP to assign to any device, e.g. printers, static IP addresses, etc.):
Router# config t Router(conf)# ip dhcp excluded-adress <excluded address list> Now you have to set up a pool, a pool of IP addresses:
Router(conf-dhcp)# ip dhcp pool <pool name> now remember the pool is all possible host of the network addresses that you will assign here:
Router(conf-dhcp)# network <network> <mask or /length> now you set up the default gateway (which in this case is itself):
Router(conf-dhcp)# default-router <gateway address> The line above excludes the default gateway's IP address from the pool.
Setting up DNS server's IP address to exclude that too:
Router(conf-dhcp)# dns-server <DNS server list> Now if you want to check DHCP clients, simply type:
Router(conf-dhcp)# ip dhcp binding 
Exactly what you asked for: service dhcp
What you probably wanted: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfdhcp.html
The trick is that the pool has to be in the same network as assigned to an interface.
configuration for dhcp from cisco router:
Router(config)# service dhcp Router(config)# ip dhcp excluded-address low-address [high-address] Router(config)# ip dhcp pool name Router(config)# no ip dhcp conflict logging Router(dhcp-config)# network network-number [mask | /prefix-length] Router(dhcp-config)# domain-name domain 
