Well I have it on the router accessing the Internet, because I have a default route, everything gets routed to that router. even RFC1918 address, but I don't want to route these addresses to the Internet, so I placed the following three routes on the router.
ip route 10.0.0.0 255.0.0.0 Null0
ip route 172.16.0.0 255.240.0.0 Null0
ip route 192.168.0.0 255.255.0.0 Null0
You could allso use this as a simple form of access filtering.
Yes insteed of following the default route, it would be dropped.
If you have ever seen a network completly infected with virus, you have probably noticed that infected host send packets to all sorts of rfc1918 address, these would get dropped by a route to a Null0 interface.
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