You can Change default gateway and routing settings. I will explain Oracle Linux Add route & Delete route Default Gateway in this post.
Linux Add route delete route default gateway
Add & Delete default gateway
You can add default gateway to the linux like below.
route add default gw 192.168.163.1
If you want to delete default gateway you can execute like following script.
route delete default gw 192.168.163.1 eth1
Add route & Delete route
You can add routing and gateway settings like below.
route add -net 192.168.63.0/24 gw 192.168.163.1
Or if you want to do permanent routing, you can create route file like below.
[root@deveci02 ~]# [root@deveci01 network-scripts]# cat route-eth1 192.168.63.0/24 via 192.168.163.1 dev eth1 192.168.161.0/24 via 192.168.161.1 dev eth0
If you create routing file like above then you can restart network service like below.
[root@deveci01 network-scripts]# service network restart
then Routing will be like below.
[root@deveci01 network-scripts]# route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 192.168.161.1 0.0.0.0 UG 0 0 0 eth0 link-local * 255.255.0.0 U 0 0 0 ibbond0 192.168.161.0 * 255.255.255.0 U 0 0 0 eth0 192.168.16.0 * 255.255.255.0 U 0 0 0 ibbond0 192.168.18.0 * 255.255.255.0 U 0 0 0 veth1 192.168.19.0 192.168.18.1 255.255.255.0 UG 0 0 0 veth1 192.168.63.0 192.168.163.1 255.255.255.0 UG 0 0 0 eth1 192.168.163.0 * 255.255.255.0 U 0 0 0 eth1