IP addresses are like networking telephone numbers -- when
you want to call someone on the phone, you must first know their telephone
number. Similarly, when a computer on the Internet needs to send data to
another computer, it needs to know its IP address. IP addresses are typically
shown as four numbers separated by decimal points, or "dots." For
example, 10.24.254.3 and 192.168.62.231 are IP addresses.
you need to make a phone call but you only know the person's name, you can look
them up in the phone book, (or call
directory services) to get their phone number. On the Internet, that directory
is called the Domain Name System, or DNS for short. If you know the name of a
server, say www.cert.org, and you type this into your web browser, your
computer will then go ask its DNS server what the numeric IP address is that is
associated with that name.
computer that is on the Internet has an IP address associated with it that
uniquely identifies it. However, that address may change over time, especially
if the computer is
Dialing into an
Internet Service Provider (ISP)
Connected behind a
Connected to a
broadband service using dynamic IP addressing
So what is static and dynamic addressing?
Static IP addressing occurs when an ISP permanently assigns
one or more IP addresses for each user. These addresses are hard set and do not
change over time. A static IP address is required if you have a computer that
is connected on the Internet but not necessarily hosting a website, its
primarily used for a remote desktop connection. A remote desktop connection
lets you extend your internal network to another computer that could be
thousands of miles away and it would appear just like it is in the next room.
If you did not have a static IP address and either the host or remote computer
in the remote desktop connection was to get shutdown and restarted very likely
you would get assigned a new IP address and your remote desktop connection
would no longer work without reconfiguring it.
IP addressing allows the ISP to efficiently utilize their address space. Using
dynamic IP addressing, the IP addresses of individual user computers may change
over time. If a dynamic address is not in use, it can be automatically
reassigned to another computer as needed.