CentOS 7.x ip command
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Add static IP to IPv4 interface using ip command
In CentOS 7.x multiple IPv4 addresses can be associated with same interface without needing aliases (eth0:0). The older ifconfig command will show only one of these multiple addresses.
Hence use following command to check interface ip addresses:
ip addr show
Add IP to interface using:
ip address add 10.90.144.251/21 dev enp0s25
Similarly existing IP can be removed using
ip add del 10.0.0.0/21 dev enp0s25
Increase priority of preferred default gateway using ip command
If there are multiple connections, eg one wireless and one wired, then we can choose preferred network (default-gateway) using ip command. For this, to check existing priorities use:
ip route show
To increase priority of a gateway, add it again using:
ip route add default via 172.16.1.1 dev wlp3s0 proto static metric 50
Note that having two default routes for 172.16.1.1 with two different metrics is not a problem.
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