Configuring Cisco 2650 Router By John Teissonniere Manny Jacome Cisco IOS DHCP Server Configuring Cisco 2650 Router By John Teissonniere Manny Jacome 5/2/2019

What Is Dynamic Host Control Protocol? Provides configuration parameters, such as: Client IP address and subnet mask Default gateway 5/2/2019

Network Implementation Single LAN VLANs using a relay agent 5/2/2019

DHCP IOS Server 5/2/2019

How Does It Work DHCPDISCOVER (broadcast) UDP protocol, port 67 Destination address of 255.255.255.255 Source address 0.0.0.0 Relay agent (ip helper-address) 5/2/2019

How Does It Work DHCPOFFER (unicast message can be from one or several DHCP servers) Offer on port 68 Lease time Renewal time Domain name server Wins server DNS server 5/2/2019

How Does It Work DHCPREQUEST Broadcast (to all DHCP servers available) Server identifier option field No ip address yet 5/2/2019

How Does It Work DHCPACK(unicast) Contains network information Client in bound state 5/2/2019

Benefits of DHCP Reduced internet access costs Reduced client configuration tasks and costs Centralized management 5/2/2019

Configuring the Server Identify TFTP,FTP,RCP servers to store database Identify assignable IP addresses Identify DHCP options for devices: Default router(s) DNS server(s) NetBIOS name server 5/2/2019

IPCONFIG / All 5/2/2019

To Configure Cisco IOS DHCP Server Feature (Steps) Configure a DHCP database agent or disabling DHCP conflict login Excluded IP addresses Configure a DHCP address pool DHCP relay agent using IP helper-address command (performed at the switch) 5/2/2019