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Lesson 3
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Understanding NAT
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9-13
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Figure 9-1
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Use the Routing and Remote Access console to configure NAT.
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NAT translates private IP addresses and the Transmission Control Protocol/User Datagram Protocol (TCP/UDP) port numbers associated with them into public IP addresses. It also assigns a unique port number to the session. Each client computer on the private network is mapped to one public IP address assigned by the Internet Network Infor mation Center (InterNIC) or the company s ISP and assigned a unique port number generated by the NAT server. This mapping enables the NAT server to send packets back to the correct workstations. Lesson 4 examines the possibility of multiple public IP addresses associated with private IP addresses. For now, let s look only at multiple private IP addresses being mapped to one public address. See Table 9-2 below for all the information stored in the mapping table of a Windows Server 2003 server.
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Table 9-2
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Network Address Translation Session Mapping Table
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Description Protocol used to transmit packet. Either TCP or UDP. Outbound or inbound traffic. IP address of internal computer. Private port number assigned to the client s session. Public IP address assigned by the ISP or InterNIC that is routable. Public port number assigned to the session. The remote IP address the client is attempting to access. If the client is connecting to a Web site, this is usually the IP address of the DNS server that services clients on the internal network. The port number assigned to the session. If this is the connection to the remote DNS server, the port number will be port 53.
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Table Value Protocol Direction Private Address Private Port Public Address Public Port Remote Address
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Remote Port
9-14
9
Designing Internet Connectivity
Table 9-2
Network Address Translation Session Mapping Table (Continued)
Description Used to keep track of entries in the mapping table. The entry will be removed if no traffic is being sent over the connection for a certain length of time. As new traffic is received by a client, the idle time is reset.
Table Value Idle Time
Figure 9-2 illustrates a server running the NAT protocol in a small business environ ment. The NAT server maps all of the private IP addresses to the public IP address, 66.x.130.77, which can connect to the Internet. The following steps are initiated: 1. The client attempts to connect to a public IP address from the private internal network. 2. The client s IP stack creates an IP packet with a destination IP address the cli ent is attempting to connect to, a source IP address of 192.168.8.2, a destina tion TCP or UDP port, and a source port. 3. Because the destination IP address is not located on the local subnet, the packet is forwarded to the client s default gateway address, which is the NAT server. 4. NAT translates the source IP address of the client s packet to the external IP address, 66.x.130.77, maps the TCP or UDP source port, places this mapping information in a table, and then sends the packet over the Internet. 5. The responding computer sends a response back to the NAT server, which uses the mapping table to translate the public IP address, and the external port fields, included in the IP header, to the private IP address and internal port of the client.
66.x.130.77
Internet
NIC 192.168.8.1
Figure 9-2 NAT forwards packets from a private network to the public Internet.
Shortage of IP Addresses
NAT was created as a temporary solution to a shortage of IP addresses available to han dle the large number of users requesting them from the InterNIC. At one time, IP addresses were plentiful. Presently, users are connecting to the Internet by the millions, causing IP addresses to become scarcer. Because most users are using Internet Protocol version 4 (IPv4), NAT is still one of the solutions to the shortage of IP addresses.
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