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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
31,305
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
24,406
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
24,331
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
53,729
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
25,367
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