show dns default route release/renew IP nmcli dhclient -r resolv.conf

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default route 
route -n

DNS
cat /etc/resolv.conf

How can I renew or release an IP in Linux for eth0?

To renew or release an IP address for the eth0 interface, enter:
$ sudo dhclient -r eth0
$ sudo dhclient eth0
In this example, I am renewing an IP address for my wireless interface:
sudo dhclient -v -r eth0
sudo dhclient -v eth0

nmcli command (NetworkManager) to renew IP address in Linux

The NetworkManager daemon attempts to make networking configuration and operation as painless and automatic as possible by managing the primary network connection and other network interfaces, like Ethernet, WiFi, and Mobile Broadband devices command-line tool for controlling NetworkManager. The nmcli is a command-line tool for controlling NetworkManager and getting its status. To renew IP address using nmcli for connection named ‘nixcraft_5G’ (use ‘nmcli con‘ command to get list of all connections):
nmcli con
nmcli con down id 'nixcraft_5G'
nmcli con up id 'nixcraft_5G'


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