Configuring the default gateway (router)

Configuring the default gateway

●Confirmation of the current default gateway
Execute the “route -n” command. “-n” is an option to display the hostname as IP.

[root@Lion ~]# route -n
Kernel IP routing table
Destination       Gateway         Genmask        Flags   Metric   Ref   Use   Iface
0.0.0.0          192.168.11.1      0.0.0.0           UG     100        0     0      eth0
192.168.11.0    0.0.0.0        255.255.255.0     U      100        0     0       eth0

The Gateway with default Destination is 192.168.11.1, so we know that the default gateway is 192.168.11.1.

●Remove the default gateway
Set “del” as the argument of the route command, and set the IP address of the default gateway device (192.168.11.1) that you want to delete after “default gw”.

[root@Lion ~]# route del default gw 192.168.11.1

[root@Lion ~]# route -n
Kernel IP routing table
Destination       Gateway         Genmask        Flags   Metric   Ref   Use   Iface
192.168.11.0    0.0.0.0        255.255.255.0     U      100        0     0       eth0

●Setting up a new default gateway
Set “add” as the argument of the route command, and set the IP address (192.168.11.2) of the default gateway device you want to set after “default gw”.

[root@Lion ~]# route  add gw 192.168.11.2

[root@Lion ~]# route -n
Kernel IP routing table
Destination       Gateway         Genmask        Flags   Metric   Ref   Use   Iface
192.168.11.0    0.0.0.0        255.255.255.0     U      100        0     0       eth0
0.0.0.0          192.168.11.2      0.0.0.0           UG     100        0     0      eth0

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