Telematics Chapter 6: Network Layer - Freie Universität Berlin
Telematics Chapter 6: Network Layer - Freie Universität Berlin
Telematics Chapter 6: Network Layer - Freie Universität Berlin
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NAT Variants<br />
● Disadvantages of static NAT:<br />
● With static mapping, you need as much public IP addresses as you have<br />
computers<br />
● With dynamic mapping, you need less public IP addresses, but for times of high<br />
traffic you nevertheless need nearly as much addresses as local computers<br />
● Those approaches help to hide the network structure, but not to save addresses<br />
● Hiding NAT (also: NAPT: <strong>Network</strong> Address Port Translation, Masquerading)<br />
● Translates several local addresses into the same external address<br />
● Now: some more details are necessary to deliver a response<br />
192.168.0.2 192.168.0.3<br />
Server<br />
Computer<br />
Computer<br />
Ethernet<br />
Computer<br />
192.168.0.4 192.168.0.5<br />
router with<br />
NAT box<br />
destination?<br />
Private IP Map to<br />
to: 147.216.12.32<br />
192.168.0.2 147.216.12.32<br />
192.168.0.3 147.216.12.32<br />
192.168.0.4 147.216.12.32<br />
192.168.0.5 147.216.12.32<br />
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ <strong>Telematics</strong> ▪ <strong>Chapter</strong> 6: <strong>Network</strong> <strong>Layer</strong><br />
Internet<br />
6.89
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