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Table of Contents I. Overview II. Introduction to DHCP Proxy Agents III. Basic Operations of DHCP Proxy Agents IV. Security Functios of DHCP Proxy Agents V. Summary and Closing Appendix A - Format of DHCP Messages in IP Address Allocation/Lease Procedure Appendix B - Format of DHCP Messages in IP Address Renewal Procedure Appendix C - Format of DHC...
11/07/2013
47,447
Table of Contents I. Overview II. Why are DHCP Relay Agents Needed in DHCP Operations ? III. Basic Operation of DHCP Relay Agents Appendix - Format of DHCP Messages in a Network with DHCP Relay Agents I. Overview This document provides a technical understanding of a DHCP relay agent that is required in a multi-subnet environment where a DHCP client...
11/05/2013
163,626
We will look into DHCP Option 82 used in the wireline networks of network operators today. Most of you are probably subscribing to a wireline Internet service provided by one of the network operators such as KT, SK Telecom or LGU+ (Korean Operators). When users subscribe to the Internet service, they pay a monthly fee to their network operator for using the Internet service. So, as a genera...
11/01/2013
43,482
Table of Contents I. Introduction II. Procedures for Detecting IP Address Conflicts III. DHCP Offer/ACK Messages: Broadcast or Unicast ? IV. State Transition of DHCP Clients I. Overview Dynamic Host Configuration Protocol (DHCP) has been widely adopted as a protocol for allocating network configuration data, including an IP address, dynamically to...
10/30/2013
70,478
Table of Contents I. Introduction II. IP Address Allocation/Lease Procedure III. IP Address Renewal Procedure IV. IP Address Release Procedure V. Summary VI. Closing Appendix A - Format of DHCP Messages in IP Address Allocation/Lease Procedure Appendix B - Format of DHCP Messages in IP Address Renewal Procedure Appendix C - Format of DHCP Me...
10/23/2013
274,010
Last time when we introduced a DHCP proxy agent through our previous blog post dated in September 1. 2013, we mentioned that this DHCP proxy agent can offer the benefits of enhanced security. So, we will look into these security-related functions in more detail today. As shown in the figure below, if there is a DHCP proxy agent in a network, all DHCP messages (used in IP address allocation...
10/01/2013
33,716
Now that we know what DHCP relay agents are, we will find out another DHCP agent, a DHCP proxy agent today. What a DHCP relay agent does is simply relay broadcast DHCP packets (DHCP Discover/Request) to DHCP server(s) located in other subnets whenever it receives packets from a DHCP client residing in that same subnet. On the other hand, a DHCP proxy agent not only relays the DHCP packets...
09/01/2013
34,096
We talked about the basic operations of DHCP in our previous blog post, "What is DHCP?”. Today, we will find out what kind of agent a DHCP relay agent is. Generally, DHCP messages are broadcasted. 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. That is because routers do not fo...
08/01/2013
74,504
As we need a phone number to make a call to someone, we need an address to communicate with a network host over the Internet. This address is called an "Internet Protocol (IP) address". Generally, IP addresses are dynamically allocated to clients accessing the Internet, through Dynamic Host Configuration Protocol (DHCP), a protocol designed for dynamic allocation of IP addresses, as defined in...
07/01/2013
37,064
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