Routing Between Three or More Networks
In all the situations up to this point, the router configuration has only needed one route. For example, our simba gateway only has one connection to the Internet, and it only serves one network. Figure 28.8 shows how this works.
Figure 28.8. The gateway simba here only needs to route packets between two networks, which are the local LAN and the Internet.
In this simple example, the hosts lion, cheetah, lynx, and puma use simba as their default gateway to communicate with systems on the Internet. Likewise, simba also has a default router, and it is set to the router at the ISP. For a dial-up PPP connection, ...
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