DHCP Sever configuration in IOS

ip dhcp excluded-address 192.168.1.1 192.168.1.10 -> Specify a range od addresses that won't be given to DHCP clients.

ip dhcp pool LAB_POOL -> Create a DHCP pool.

network 192.168.1.0 ? -> Specify the subnet of addresses to be assigned to clients (except the excluded addresses).

dns-server 8.8.8.8 -> Specify the DNS server that DHCP clients should use.

domain-name jeremysitlab.com -> Specify the domain name of the network. (ie. PC1 = pc1.jeremysitlab.com).

default-router 192.168.1.1 -> Specify the default gateway.

lease 0 5 30 -> Specify the lease time.

• lease <days> <hours> <minutes> or lease infinite

Relay agent configuration

R1(config-if)# ip helper-addres 192.168.10.10 -> Configure the IP address of the DHCP server as the 'helper' address.

Client configuration in IOS

R2(config-if)# ip address dhcp -> Use the ip address dhcp mode to tell the router to use DHCP to learn its IP address.