![]() ![]() 1 The core function of this DHCP relay agent is to convert a broadcast DHCP packet into a unicast one, and forward it to a DHCP server.įigure 1. As shown in Figure 1 - (b), enabling the DHCP relay agent function in the router allows DHCP messages to be exchanged between a DHCP client and DHCP server residing on different subnets. To address this problem, the concept of a DHCP relay agent has long been adopted. This restriction requires all individual subnets have its own DHCP server for DHCP operation, which is practically not feasible in network operators' networks or corporate computer networks (too many DHCP servers are required in the network!). Thus a broadcast DHCP packet sent by a DHCP client cannot be delivered to DHCP server(s) on different subnet(s) through a router (shown in Figure 1 - (a)). one with a destination MAC address of FF:FF:FF:FF:FF:FF and a destination IP address of 255.255.255.255) to other interfaces. That is because routers do not forward any broadcast IP packet (i.e. So, in order for the messages to be exchanged between a DHCP client (PC) and DHCP server, both the client and server have to reside on the same subnet. ![]() Generally, DHCP messages are broadcasted. Why are DHCP Relay Agents Needed in DHCP Operations? Finally, in Appendix, specific message parameters used by DHCP relay agents in each DHCP procedure will be presented.īefore you read this document it is recommended that you refer to the companion documents, “ Understanding the Basic Operations of DHCP” and “ Understanding the Detailed Operations of DHCP”. Chapter III describes the basic principles of DHCP operations using a DHCP relay agent. Chapter II explains why these DHCP relay agents are needed in DHCP operations. This document provides a technical understanding of a DHCP relay agent that is required in a multi-subnet environment where a DHCP client and a DHCP server reside in different subnets. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |