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TCP/IP Guide by Charles M. Kozierok

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IP Address Management and Assignment Methods and Authorities

What would happen if you told someone that you lived at 34 Elm Street, and when he turned onto your road, he found four different houses with the number 34 on them? He probably would find your place eventually but wouldn't be too pleased. Neither would you or your mail carrier! And all of you folks are much smarter than computers. Like street addresses, IP addresses must be unique for them to be useful.

Multihomed devices on an IP internetwork This internetwork consists of two LANs, A (above) and B (below). LAN A has a multihomed workstation, shown with two IP network interface "circles." The two LANs are connected together through a multihomed, shared server that has been configured to route traffic between them. Note that this server also handles all traffic passing between LAN B and the Internet (since the Internet connection is in LAN A only).

Figure 16-5. Multihomed devices on an IP internetwork This internetwork consists of two LANs, A (above) and B (below). LAN A has a multihomed workstation, shown with two IP network interface ...

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