Set Default Network Interface
- #To make packets with destinations 192.168.10.* use eth0, and all other packets use eth1:
- 1) View your current routing table
- ip route list
- One entry will be something like "default via 192.168.1.1" where 192.168.1.1 is your router (a.k.a. gateway) ip address. Remember the gateways for eth0 and eth1, as we'll need them later.
- 2) Delete the default route(s). (Warning: this will kick you offline.)
- ip route del default
- 3) Add a new default route (this will bring you back online). Replace 192.168.1.1, below, with your gateway ip address from above.
- ip route add default via 192.168.1.1 dev eth1
- 4) Add a specific route that will be served by eth0. More-specific routes automatically take precedence over less-specific ones.
- ip route add 192.168.10.0/24 via 192.168.1.1 dev eth0
- Finally, you can ask Linux which interface will be used to send a packet to a specific ip address:
- ip route get 22.214.171.124
- If the configuration worked, packets to 126.96.36.199 (Google's server) will use eth1. Packets to any ip on your local network:
- ip route get 192.168.10.7
- will use eth0.
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