NetworkManager and nmtui

# nmtui
These connections are managed by SystemManager
# systemctl restart NetworkManager
# systemctl status NetworkManager
check the connection information:
# ip a
Temporary base:
# ip route show
# ip route add 10.0.1.0/24 via 192.168.4.44
This route say to computer the next IP hop from routing steps.
Make the route permanent by edit the file:
# vi /etc/sysconfig/network-scripts/ifcfg-ens33
GATEWAY=192.168.3.4
After doing changes use the restart:
# nscli con down ens33; nmcli con up ens33

Troubleshooting:
# hostname
# ping example.com
# traceroute example.com
# dig example.com
# nmap example.com
# netstat -tulpen