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From your LAN you difine the routers IP address as the Gateway ( router is the boundary for your network), from yoyr router you need to access the outside network, in that case you could apply two methods
1) use a default network as the next network connected ( for Example Internet Service Provider)
ip default-network NEXT network address
example ip default-network 172.20.165.0
you can add another instance for default network( this will be used if the above fails)
ip default-network192.168.100.0
2) even if you do not know the IP address of the next hop router you can use the following
ip route0.0.0.00.0.0 . in this case router will forward all traffic to the next router and next router will find the routes onwards
You need a router to communicate a different network. THen use a routing protocols to communicate two different networks
