nmtui is a terminal user interface (tui) to control Network Manager (nm). Network Manager is a complete solution for networking that takes care of all the indiv

nmtui is a terminal user interface (tui) to control Network Manager (nm). Network Manager is a complete solution for networking that takes care of all the individual parts of networking. But as far as I know it does not change your firewall rules. You would need to use iptables for that directly, because this is not something that can be reasonably automated without actually knowing what the user wants. systemd is an init system with a lot of bells and whistles. One of the whistles is systemd-networkd, which is also a complete networking solution, but it also delegates some work to systemd-resolved. It also doesn't take care of firewalling. If you want to get a better understanding on how networks are set up, then you should rather look for more low-level tools like iproute2 (which provides the "ip" tool) and dhclient/dhcpd. For wireless you should look at wpa_supplicant (which is afaik used by Network Manager under the hood). And then there is of course iptables which is used to manipulate the flow of packages through the network. It should be noted that eBPF is intended to replace iptables but knowledge of iptables will still prove useful for many years to come.