Any configuration set using IP are temporary and can be lost by restarting network services, turning the interface off, or even system reboot.Īs an example to show how to set static routes on Linux systems using IP command, consider our Main router above. IP command can be used to set static routes on Linux system.

Via Static route definition in /etc/sysconfig/network-scripts/route-INT config on CentOS/RHEL systems How to Set Static Routes using IP command.

Via static configurations in /etc/network/interfaces file on Debian systems.

There are different ways in which you can set static routes via an interface/IP on CentOS/Ubuntu systems Once the route to LAN A is added to the Main Router, Router B and subsequently LAN B, can be able to communicate with LAN A. This will also means that, once the route to LAN B has added to the Main Router routing table, Router A and subsequently LAN A, can be able to communicate with LAN B. Main router can only be able to communicate with LAN B (172.16.10.0/24) via Router B, 21.22.23.10. Add Static Routes to LAN A and LAN B on Main Router Note, all the routers we have in place are Linux based routers. Therefore, for systems on Site A, LAN A and Site B, LAN B to communicate, static routes to each network need to be defined explicitly on the MAIN router’s routing table.

Systems on LAN B can only know how to communicate to systems on LAN A via Router B.

Systems on LAN A can only know how to communicate to systems on LAN B via Router A.Router B/LAN B can only communicate with LAN A via Main router.

Router A/LAN A can only communicate with LAN B via Main router.Main Router can only communicate with LAN A via Router A.Main Router can only communicate with LAN B via Router B.Similarly, systems on Site B, LAN B cannot reach systems on Site A, LAN A, but it can reach Site A Public router IP (11.12.13.10).However, it can reach Site B Public router IP (21.22.23.10). Systems on Site A, LAN A cannot reach systems on Site B, LAN B.So how can you set static routes via an interface/IP on CentOS/Ubuntu?Ĭonsidering an example network architecture above

Ubuntu route add static