qr code c# tutorial Common Address Translation Types in Objective-C

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Common Address Translation Types
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With static NAT, a manual translation is performed by an address translation device, translating one IP address to a different one Typically, static NAT is used to translate destination IP addresses in packets as they come into your network, but you can translate source addresses also Figure 23-1 shows a simple example of outside users trying to access an inside web server In this example, you want Internet users to access an internal web server, but this server is using a private address (10111)
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FIGURE 23-1
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Address translation table Inside local IP 10111 Inside global IP 2002002001
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Src IP = 199101725 Dst IP = 10111 Src IP = 199101725 Dst IP = 2002002001
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This creates a problem, since if an outside user would put a private address in the destination IP address field, their ISP would drop this Therefore, the web server needs to be presented as having a public address This is defined in the address translation device (in this case, it is a Cisco router) The web server is assigned an inside global IP address of 2002002001 on the router, and your DNS server advertises this address to the outside users When outside users send packets to the 2002002001 address, the router examines its translation table for a matching entry In this case, it sees that 2002002001 maps to 10111 The router then changes the destination IP address to 10111 and forwards it to the inside web server Note that if the router didn t do the translation to 10111, the web server wouldn t know this information was meant for itself, since the outside user sent the traffic originally to 2002002001 Likewise, when the web server sends traffic out to the public network, the router compares the source IP address to entries in its translation table, and if it finds a match, it changes the inside local IP address (private source address, 10111) to the inside global IP address (public source address, 2002002001)
Dynamic NAT
With static address translation, you need to build the translations manually If you have 1000 devices, you need to create 1000 static entries in the address translation table, which is a lot of work Typically, static translation is done for inside resources that outside people want to access When inside users access outside resources, dynamic translation is typically used In this situation, the global address assigned to the internal user isn t that important, since outside devices don t directly connect to your internal users they just return traffic to them that the inside user requested With dynamic NAT, you must manually define two sets of addresses on your address translation device One set defines which inside addresses are allowed to be translated (the local addresses), and the other defines what these addresses are to be translated to (the global addresses) When an inside user sends traffic through the address translation device, say a router, it examines the source IP address and compares it to the internal local address pool If it finds a match, then it determines which inside global address pool it should use for the translation It then dynamically picks an address in the global address pool that is not currently assigned to an inside device The router adds this entry in its address translation table, the packet is translated, and the packet is then sent to the outside world If no matching entry is found in the local address pool, the address is not translated and is forwarded to the outside world in its original state
23: Address Translation
When returning traffic comes back into your network, the address translation device examines the destination IP addresses and checks them against the address translation table Upon finding a matching entry, it converts the global inside address to the local inside address in the destination IP address field of the packet header and forwards the packet to the inside network
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