And yes, look at this.
Congratulations!
You've reached the end of another module.
In our module we've been investigating host‑based firewalls,
and on our Red Hat Enterprise Linux clones our
AlmaLinux system that uses firewalld.
Now that's managed through firewall‑cmd.
We've taken a look at managing our runtime,
our in‑memory settings, as well as our persistent or our permanent settings.
We've investigated services, so our XML files that describe,
then, the services that we can allow; our zones,
which can group, then, services and ports together along with our active zones,
which will have either an interface or a source address
associated with them; and of course, as well as using our services,
we can natively describe our incoming ports.
So hopefully this has simplified our management of firewalls and it's
giving you some interest in protecting your systems.
But it's not the only host‑based firewall system that we have.
On Ubuntu systems, by default, we use UFW,
or our Uncomplicated Firewall, and we're going to investigate this on our Ubuntu system in the next module.