As illustrated inFigure 25.1, when a DHCP client requests an IP address, it sends a DHCPDISCOVER message to the router, which can act as a relay agent. The router forwards the message to the DHCP server. When the DHCP server receives the DHCPDISCOVER message, it determines the network segment to which the client belongs and assigns an IP address. The DHCP server then sends a DHCPOFFER message that includes the IP address and other network configuration information. When the router receives the DHCPOFFER message, it broadcasts the message to the client that sent the DHCPDISCOVER message.
Figure 25.1 IP Address Allocation Process
12DHCP client sends a DHCPDISCOVER
message for an IP address.
DHCPDISCOVER
DHCP Client requesting an IP address
DHCPOFFER
When the router (relay agent) receives the DHCPDISCOVER message, it forwards the message to the DHCP server.
10.1.1.1
Router (Relay Agent)
When the DHCP server receives the DHCPDISCOVER message, it determines the network segment to which the client belongs, and then assigns an IP address accordingly. It then sends a DHCPOFFER message with the IP address and other network information.
3DHCP Server (NIOS appliance)
10.1.1.0/24
4 When the router receives the DHCPOFFER
message, it broadcasts the message to the DHCP client.
Address Range
10.1.1.20 - 10.1.1.200
1104NIOS Administrator Guide (Rev. A)NIOS 8.1
IPv6 DHCP Protocol Overview
Manage space
Manage content
Integrations
App links