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4.3.1. Default Route
A default route matches all destinations and is used when no more specific route exists.
IPv4:
Router(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1
Router(config)# ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
IPv6:
Router(config)# ipv6 route ::/0 2001:DB8:1::1