TLDR
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ip route

 
IP Routing table management subcommand. More information: https://manned.org/ip-route.
 
  • Display the routing table:
     
    ip route {{show|list}}
     
  • Add a default route using gateway forwarding:
     
    sudo ip route add default via {{gateway_ip}}
     
  • Add a default route using eth0:
     
    sudo ip route add default dev {{eth0}}
     
  • Add a static route:
     
    sudo ip route add {{destination_ip}} via {{gateway_ip}} dev {{eth0}}
     
  • Delete a static route:
     
    sudo ip route del {{destination_ip}} dev {{eth0}}
     
  • Change or replace a static route:
     
    sudo ip route {{change|replace}} {{destination_ip}} via {{gateway_ip}} dev {{eth0}}
     
  • Show which route will be used by the kernel to reach an IP address:
     
    ip route get {{destination_ip}}

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