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There are a number of addresses that you can use on an internal network that is, a network that s not connected directly to the Internet You can use these addresses to set up your network and then use systems like Network Address Translation (NAT) or proxy servers to provide your connectivity to the Internet without having to have a public IP address We ll look at Internet connection methods in 5 Three address ranges are available, each within a different class so you can define different networks and hosts within your network according to your needs The internal ranges are as follows:
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Class A 10000 Class B Class C 1721600 to 17231255255 19216800 to 192168255255
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For example, if you wanted to create a network using a Class C network address, you would use the 19216800 range
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The Internet Connection Sharing (ICS) and Network Address Translation (NAT) system uses the 19216800 range to connect client computers to the Internet through a gateway machine
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The problem with the class system is that although it s neatly divided into networks and hosts, it s still possible to have too many addresses available to you when you are trying to create nice, tight little groups of computers You can get
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CHAPTER 2 Planning and Implementing TCP/IP
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around this by creating a subnet A subnet divides a network with a number of potential host addresses and divides it up into a number of smaller subnetworks For example, imagine a Class C network with 254 potential hosts that you want to divide into a number of subnets so that you can put sales and marketing into their own groups To create a subnet, use the same basic principle that created the class system in IP addresses, but use it on one of the small ranges Say, for example, you have a Class C network of 19216810 that you want to split into two To do that, you use the first bit of the last octet to specify one subnet of 128 hosts (because using that first bit to split the network in two reduces the number of host bits to 7) You now have two networks, 19216810 to 1921681127 and 1921681128 to 1921681255 You can repeat the exercise by borrowing more bits If you use 2 bits to specify the network, you get 4 networks of 64 hosts each Three bits would create 8 networks of 16 hosts Each time you borrow a bit, you double the network and halve the number of hosts
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In fact, you lose two addresses for each additional network you create, because the first and last addresses in each subnet are again used to define the network as a whole and the broadcast address for the network Thus, a subnet that is defined by borrowing two bits might have a network address of 192168164 and a broadcast address of 1921681127 Technically, subnets are also created if you use a Class A or B address to define one or more networks within the entire allocation range For any type of subnetting to work, though, you need to tell the computer how the subnet is defined, and that s where the subnet mask comes in
Subnet Masks
Once you created a subnet, the subnet mask tells the machine how the subnet is organized The combination of the machine s address and its subnet mask enables the machine to determine which subnet it s a part of With this information, it can also determine whether other hosts with a given IP address are within the same network It then determines whether the machine can be contacted directly, or whether it needs to send the packet to a router on the network to reach its destination The way it does this is to AND the binary representation of the IP address with the subnet mask A subnet mask defines which bits are used to identify a network So, for a Class C network, the first three octets (24 bits) are used to define the
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