Dhcp, Automatic Allocation Of Ip Addresses; Translating Ip Addresses And Domain Names; Using A Single Ip Address For Your Entire Network - Eminent EM8026 Mode D'emploi

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EMINENT ADVANCED MANUAL

DHCP, Automatic allocation of IP addresses

For the development of DHCP (Dynamic Host Configuration Protocol), TCP/IP settings
are configured manually on each TCP/IP client (such as your computer for example).
This can be a difficult job if it is a big network or if something has to be changed
regularly in the network. DHCP was developed to avoid always having to set up an IP
address. With DHCP, IP addresses are allocated automatically when necessary and
released when no longer required. A DHCP server has a series ('pool') of valid
addresses that it can allocate to the client. When a client starts for example, it will
send a message requesting an IP address. A DHCP server (there can be several in a
network) responds by sending back an IP address and configuration details. The client
will send a confirmation of receipt after which it can operate on the network.

Translating IP addresses and domain names

IP addresses are far from user-friendly. Domain names are however easier to
remember and use. The process of translating a domain name into an address that is
understandable for a machine (such as your computer) is known as 'name resolution'.
A 'Domain Name System' server carries out the afore-mentioned process. Thanks to
DNS, you use domain names instead of IP addresses when visiting a website or
sending e-mails.
Dynamic DNS or DDNS is a DNS-related option. You can still link your IP address to a
domain name using DDNS if your provider works with dynamic IP addresses
('dynamic' here means that the IP addresses change frequently). After all, the IP
address to which your domain name refers will also change when your provider
changes your IP address. You must register with a Dynamic DNS provider such as
www.dyndns.org and www.no-ip.com in order to use Dynamic DNS.
Using a single IP address for your entire
network
Network Address Translation (NAT) is an Internet standard with which a local network
can use private IP addresses. Private IP addresses are those used within an own
network. Private IP addresses are neither recognized nor used on the Internet. An IP
address used on the Internet is also called a public IP address.
NAT enables you to share a single public IP address with several computers in your
network. NAT ensures the computers in your network can use the Internet without any
problems but users on the Internet will not have access to the computers in your
network. You will understand that NAT also offers a certain level of security partly due
to the fact that private IP addresses are not visible on the Internet.
Fortunately, most routers currently use NAT.