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Most networks, including the Internet, use a set of network protocols called TCP/IP, which stands for Transmission Control Protocol/Internet Protocol. On a TCP/IP network such as the Internet, each computer is given a unique address called an IP address. The IP address is used to identify and locate a particular host-a computer connected to the network. It consists of a number, usually four sets of three numbers separated by periods. An example of an IP address is 192.168.0.1. You will have to assign an IP address to each host on your network. The IP address consists of a number composed of four segments separated by periods. Depending on the type of network, several of the first segments are used for the network address and several of the last segments are used for the host address. For a small local network, the first three segments are the computer's network address and the last segment is the computer's host ID (as used in these examples). For example, in the address 192.168.0.2, 192.168.0 is the network address and 2 is the computer's host ID within that network. Together, they make up an IP address with which the computer can be addressed from anywhere on the Internet. IP addresses, though, are difficult to remember and easy to get wrong.
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To set up a DNS server for a local area network (LAN) whose hosts are not directly connected to the Internet, you would use a special set of IP numbers reserved for such non-Internet networks (also known as private networks or intranets). This is especially true if you are implementing IP masquerading, where only a gateway machine has an Internet address, and the others make use of that one address to connect to the Internet. For a small network (254 hosts or less), these are numbers that have the special network number 192.168.0, as used in these examples. If you are setting up a LAN, such as a small business or home network, you are free to use these numbers for your local machines. For a local network, assign IP addresses starting from 192.168.0.1. The host segment can range from 1 to 254, where 255 is used for the broadcast address. If you have three hosts on your home network, you can give them the addresses 192.168.0.1, 192.168.0.2, and 192.168.0.3. The network address for such a network would be the first three segments of the IP address, 192.168.0. The network netmask would cover those first three segments, using the number 255.255.255.0. The network netmask is used to determine the host and network parts of an IP address. The broadcast address is used to allow an administrator to contact all hosts at once. You would then use these three IP addresses when configuring a host. Network IP address Network netmask Host IP addresses Broadcast address 192.168.0.0 255.255.255.0 From 192.168.0.1 to 192.168.0.254 192.168.0.255
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In the sample network used in these examples, there are three hosts, each with its own IP addresses and hostnames listed here. The network address, netmask, and broadcast address are the same as those listed above:
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192.168.0.1 192.168.0.2 192.168.0.3
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Figure 7-3 shows the format of the sample network with their Ethernet connections and IP addresses, along with their hostnames.
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Figure 7-3: Sample local network Ethernet connections, IP addresses, and hostnames
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Though it may look like a single IP address is assigned to an entire computer, it is important to realize that this is not actually the case. An IP address is really assigned to a network device such as an Ethernet card or DSL modem. Ordinary computers on a network will have only one network device, giving them only one IP address. However, a gateway computer will normally have at least two network devices, each with its own IP address. The device used for the local network will have the IP address you decided to give it. The device used for the Internet connection will have an IP address assigned to it by your ISP. For example, in the sample network used in these examples, the computer used as the gateway will have two Ethernet cards, one for the local network and one for the Internet. Each will have its own IP address. The Ethernet card used for the local network will have the address 192.168.0.1, and the one used for the Internet connection will have the address 10.0.0.1 assigned by the ISP (a fabricated address used for this example):
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Along with its IP address, each device will have its own hostname, as described in the next section. The Ethernet card for the local network will have the hostname you decided to give it, and the Ethernet card connected to the Internet will have a hostname assigned to it by your ISP. The hostnames used in these examples are turtle.mytrek.com for the local Ethernet card and myhost.my-internet-isp.com. The Internet connection device on the gateway will either use a static or dynamic IP address. A static IP address, such as those used for cable and DSL modems, will remain the same. This is the IP address you would assign to your Internet network device. The sample network described here uses a static address, 10.0.0.1. If your Internet connection device is a modem (in some cases, also DSL), your IP address is dynamic. Your ISP assigns you a different one each time you connect from a pool it keeps on hand. Since your Internet IP address keeps changing, you do not know what it will be any given time you connect. For this situation, when you have to reference the Internet IP address in your configurations, you reference the Internet network device instead.
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