Configuring NAT on home routers is a no-brainer, as these boxes invariably have NAT turned on automatically. Figure 6.18 shows the screen on my home router for NAT. Note the radio buttons that say Gateway and Router.
FIGURE 6.18 NAT setup on home router
By default, the router is set to Gateway, which is Linksys-speak for “NAT is turned on.” If I wanted to turn off NAT, I would set the radio button to Router.
Figure 6.19 shows a router configuration screen on a Cisco router. Commercial routers enable you to do a lot more with NAT.
FIGURE 6.19 Configuring NAT on a commercial-grade router
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