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#1 2022-04-07 22:03:02

ccm
Member
Registered: 2022-04-07
Posts: 2

iptables and nftables on same arch system

I have chosen to use nftables instead of iptables on my arch installation.
For that purpose, I have executed the following steps:
    # systemctl stop iptables && systemctl disable iptables
    # pacman -S nftables
    # mkdir /etc/nftables && then copied my nftables setup file "firewall.nft" into that folder
    # nft -f /etc/nftables/firewall.nft && nft list ruleset (and checked all rules defined as expected)
    # nft list ruleset > /etc/nftables.conf
    # systemctl enable nftables.service && systemctl start nftables.service

At this point I am assuming my arch system's firewall is managed only by nftables.

My question are:
    Shouldn't I also remove iptables from the system?
    Keeping iptables on the system does not create issues with the newly installed nftables?

I am aware the iptables service is disabled but the output of "# systemctl status iptables" is stating it is still loaded (do also reporting it is inactive, dead) and the output of "# nftables -L" states different rules (all traffic accepted).

On other Linux distros (Debian and Debian based distros as ubuntu and mint) it was possible to remove/purge completely the iptables and keep only nftables on the system.

On Arch Linux, I am guessing it is not necessary to remove completely the iptables package (also because that would break the system, as I have already tried and confirmed) but I would like to have confirmation from other's experience using nftables. Did you keep iptables on your arch system while using nftables?

Last edited by ccm (2022-04-07 22:04:04)

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#2 2022-04-08 05:36:05

-thc
Member
Registered: 2017-03-15
Posts: 204

Re: iptables and nftables on same arch system

AFAIK iptables is part of the core installation (pacstrap) and is by default disabled/inactive/dead.

The netfilter framework is inside the kernel (as modules).
iptables and nftables are "just" userland tools for controlling them.

If you disable iptables and do a reboot, everything should be in working order.

You can remove iptables userland tools, but it's not necessary.

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#3 2022-04-08 12:11:04

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 10,158

Re: iptables and nftables on same arch system

$ pacman -Qi iptables | grep Required
Required By     : iproute2  systemd
$

Not easy to remove that ....

If desired it can be replaced by iptables-nft .

I only use nftables, but as long as iptables behaves and stays inactive (which it does sofar) I don't mind (much) having it installed.


Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
Did you use the guided installer ? If yes, I can't help you.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)

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#4 2022-04-08 14:19:52

-thc
Member
Registered: 2017-03-15
Posts: 204

Re: iptables and nftables on same arch system

Lone_Wolf wrote:

Not easy to remove that ....

If desired it can be replaced by iptables-nft .

Uh oh - I either never tried that or forgot about this hmm. Thanks for clarifying.

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