Chapter 4. Your Internet Service Provider (ISP)
4.2.1. Static versus dynamic IP addressing
A static IP address never changes. It is permanently assigned to your server by your ISP.
Note: Static IP addressing is preferable to dynamic IP addressing because it makes it easier for users on the Internet to connect to your services.
Dynamic IP address assignment means that your IP address is assigned to you only temporarily and may be changed by your ISP. This makes it more difficult to ensure continuity of service to your network. Consider again our telephone number analogy. When your telephone number changes, you are able to place outgoing calls. However, until your new phone number is registered with Directory Services, other people are unable to look up your new number and place calls to you. Similarly, whenever your IP address changes, a record associating your server with its new IP address must be published with the equivalent of Directory Services (known as Domain Name Service or DNS) before incoming traffic can find you.
If your IP address is dynamically assigned and you have a dedicated connection to your ISP (for example, with a typical cablemodem), you may find it helpful to use a dynamic DNS service. We strongly recommend you review Appendix B: Dynamic DNS services for more information about this worthwhile option.
4.2.2. Routable versus non-routable IP addresses
If an IP address is analogous to your phone number, then a routable IP address is the equivalent of a full telephone number complete with country code and area code such as
4.3. Arranging connectivity with your ISP
If you are going to be using your server in "server and gateway" mode, you will need to arrange for a connection to the Internet. Your ISP will help you connect your site and provide you with services that enable you to take advantage of the Internet (e.g.
To connect your site to the Internet, you not only need to arrange your physical connection (modem, DSL, etc.), but you also need to ensure that your server can locate the appropriate devices at your ISP's site. Your ISP will give you this information (e.g. IP addresses for their devices) which must eventually be entered into your server console (a straightforward process covered in a later chapter). Many ISPs use a DHCP server which can directly configure your server with some or all of these parameters.
4.3.1. Ordering a corporate ADSL or other commercial dedicated connection
Typically, your ISP will arrange for and configure your external hub and router. Alternatively, you may be required to install that hardware yourself under their direction. If a special phone line is required, the ISP will typically arrange that. It is most typical with
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