Supporting DHCP for Remote Subnets with DHCP Relay
Network engineers have a major design choice to make with DHCP: Do they put a DHCP server in every LAN subnet, or locate a DHCP server in a central site? With a DHCP server in every subnet, the protocols work as shown in Figure 18-1, and the router can ignore DHCP completely. However, with a centralized DHCP server, many DHCP clients sit in a different subnet than the DHCP server. So far in this section, it appears that the DHCP message would never reach the DHCP server, because routers do not route (forward) IPv4 packets sent to destination IP address 255.255.255.255.
Many enterprise networks use a couple of DHCP servers at a centralized site, supporting DHCP services to all remote subnets. ...
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