Presentation written by Carol A. Hopkins. Presented on March 10, 2008 for Seton Hall CSAS 4081, taught by Dr. Wachsmuth DHCP and Network Settings What is DHCP and its function, what is a Gateway and why do we need one, what is DNS ? What is DHCP? Decentralized Hospital Computer Program
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Presentation written by Carol A. Hopkins. Presented on March 10, 2008 for Seton Hall
CSAS 4081, taught by Dr. Wachsmuth
What is DHCP and its function, what is a Gateway and why do we need one, what is DNS?
Note: An IP address is not the same as a MAC address. A MAC address uniquely identifies a computer that has an ethernet interface. Unlike DHCP it includes no indication of where your computer is located. (http://www.dhcp-handbook.com/dhcp_faq.html)
The server temporarily reserves the IP address and send back the client an OFFER (or DHCPOFFER) packet with the address info.
The server also configures the clients DNS servers, WINS servers, NTP servers, etc. (see below)
The client sends a REQUEST (DHCP REQUEST) packet, letting the DHCP server know that it intends to use that address.
The Server sends an ACK (or DHCPACK) packet confirming client has been given a lease on the address
A DHCP Lease is the amount of time a DHCP server grants the client permission to use a particular IP address. The Administrator of the DHCP server can set this. (http://www.dhcp-handbook.com/dhcp_faq.html)
In your home, the default gateway directs Internet traffic from the local network to the Cable/DSL modem, which connects to your ISP (Internet Service Provider).
A gateway allows two different networks to connect and understand each other, it is the node on a network that interfaces with a another network that may use different protocols.
In a big network, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with:
Gateways, also called protocol converters, can operate at any layer of the OSI MODEL (Open Systems Interconnection Basic Reference Model). The job of a gateway is much more complex than that of a router or switch. Typically, a gateway must convert one protocol stack into another.
As previously mentioned, DNS information is also provided by the DHCP server.
DNS Stands for DOMAIN NAME SYSTEM.