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In your home networks, you probably see your router gets an IP address in the network 1921681 Why that address If the real owner of that address is on the Internet, and you try to access it, it would fail, right Fear not batches of IP addresses are reserved for internal use only and do not
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exist on the Internet They are not routed by routers that are part of the Internet These addresses are de ned in RFC 1918:
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10000 10255255255 A single class A network 1721600 17231255255 A group of 16 contiguous class B networks 19216800 192168255255 A contiguous group of 256 class C networks
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Nearly all companies have IP addresses in this range and a few Internet registered addresses given by your ISP that connect your company to the actual Internet Like the APIPA addresses, these addresses only work on the internal network and so are also private IP addresses
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WHAT IS AN RFC The Internet is guided by the Internet Engineering Task Force (IETF) that consists of many network designers, researchers, and other organizations When a change or new standard for the Internet is proposed, a Request for Comment (RFC) document is created and posted These can be viewed at wwwietforg/rfchtml All of the major protocols for the Internet are de ned in RFC documents
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Network Address Translation (NAT) is the process in which the gateway router at a company that connects to the Internet has a real Internet IP address, and then all other computers that send requests to the Internet do so via the rewall or router The gateway device rewrites the source and/or destination address s content in the data packet with that of the rewall/router and then sends/receives to the Internet NAT translates private IP addresses to public IP addresses This means companies no longer buy a class C network from one of the central Internet registries (like InterNIC) Instead they use Classless InterDomain Routing (CIDR) and buy one or two public IP addresses from their Internet Service Provider (ISP) The ISP purchases blocks of addresses from the Internet Registry You can see this if you run a router in your house You plug in your DSL or cable modem into the router and then hang off your three home servers, workstation, and wireless network, which all normally get a 1921681-something address given to it by the router Our router status shows the address the router was given by the
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ISP; in my case it has an address of 75940x Now 75 is a class A network, so does my ISP have a whole class A network, one of only 126 No, these networks have been allocated and broken up into smaller chunks to providers of Internet services If you look at IANAORG you can see the IP address allocations: http://wwwianaorg/assignments/ipv4-addressspace shows the IP address allocations Three main types of NAT start simply and grow in complexity:
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Static NAT The NAT router maintains a table and for each internal IP address has a corresponding external, legitimate IP address used for communication with the Internet This does not save on registering Internet addresses but can be useful where devices need to be accessible from the Internet Static is not widely used Dynamic NAT The NAT router has a list of registered legitimate IP addresses, and each time an internal client tries to access the Internet, it is mapped to one of the currently unused registered Internet IP addresses This means you need only legitimate IP addresses for the number of concurrent Internet users Single Address NAT/Overloading/Masquerading/Network Address Port Translation (NAPT) The NAT router has only one registered Internet IP address, and each internal user that needs to communicate with the Internet is mapped to a different port This is written in the form xxxx:y 10001:100 is IP address 100001, port 100 When the NAT gateway receives responses from the Internet, the originating port is included, which it maps to the originating IP address on the local intranet This is the most popular form of NAT
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In Figure 6-12, the NAT device has a mapping table of the IP addresses internally and the ports it uses for the external con guration The NAT device can inspect incoming traf c for the source port, so it can forward the traf c to the internal computer (see Table 6-2) Windows Server 2008 provides this NAT functionality, which is covered in 8, Remote Access and Securing and Optimizing the Network
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