On Thu, Oct 04, 2018 at 12:04:59AM -0400, Igor Kapushkin wrote:
Thank you very much for your answer!
Now I am curious to use NFTables with firewalld. I couldnt find
documentation explaining how to upgrade. These are my specs:
CentOS 7.5
firewalld 0.4.4.4
NFTables installed (according to "modinfo nf_tables")
You can't use the nftables backend on stock CentOS. The nftables backend
requires a 4.18+ kernel.
See the 0.6.0 release notes:
https://firewalld.org/2018/07/firewalld-0-6-0-release
Do I need to install the new version (0.6.2) firewalld from the tarball on
the website or is there an easier way?
03.10.2018, 08:41, "Eric Garver" <egarver(a)redhat.com>:
On Tue, Oct 02, 2018 at 10:08:52PM -0400, Igor Kapushkin wrote:
Hello,
I am new to firewalld and I have a some questions because I am
curious
about it.
First, the documentation says that firewalld can have multiple
backends. I
find it strange that the image on that documentation page lists
such
different things such as iptables, ebtables and NetworkManager. I
imagine
that the way firewalld interacts with iptables/ebtables/etc. is
completely
different that the way it interacts with NetworkManager. I'm
confused why
NetworkManager is called a "backend" in that case.
"backend" often just means "something not directly exposed to the
user".
Firewalld communicates with NetworkManager to manage interface to zone
assignments (e.g. --add-interface).
When referring to a FirewallBackend there are two options; iptables and
nftables. In Firewalld, nftables support is very new. These are the low
level firewall implementation offered by the OS (Linux). Firewalld
provides an abstraction over these.
Second, I have a computer running Centos 7. I can see that the
iptables is
installed, but the service (systemctl status iptables) is not part
of the
OS. I also know that on Centos 7 firewalld interfaces with
iptables. My
questions is, why is firewalld interfacing with iptables if the
iptables
service is not even installed? What's the point in doing that? I'm
not an
expert in the area, so I would really thank you if you could give
me a
hint or an explanation. I'm confused how iptables can still be
relevant if
the service is not there for systemd. How is iptables changing
anything in
that scenario?
They are two different packages that manage the underlying iptables
firewall in different ways. They should never be used simultaneously.
iptables-services is a package to maintain persistent iptables rules. At
startup it will apply rules in /etc/sysconfig/iptables. If you use it,
you must manually write iptables rules.
Firewalld abstracts firewall concepts and makes it much easier for
users. It will then translate these concepts into iptables rules and
apply them for the user.
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