I had the same problem.
If you are not using virtual machines then
# systemctl disable libvirtd
works and is easily reversible.
Alan
On 18/04/2020 23:03, Alessandro Baggi wrote:
> Il 17/04/20 11:01, Alessandro Baggi ha scritto:
>> Hi list,
>>
>> I'm studying nftables. I'm using CentOS 8.1 (Gnome) and I disabled
>> firewalld. I noticed that a default policy is created with tables and
>> chains probably for firewalld.
>>
>> So I created a .nft script where I stored my rules with a flush for
>> previous ruleset, then saved on /etc/sysconfig/nftables.conf and the
>> enabled nftables service.
>>
>> Running the script with nft -f script.nft all work as expected but
>> when rebooting, running nft list ruleset I find my rules and the
>> default policy (chains and tables) that I would not have in my
>> configuration.
>>
>> My nftables.conf contains only my ruleset.
>>
>> For example, running nft list tables I found several default tables
>> like:
>>
>> table ip filter
>> table ip6 filter
>> table bridge filter
>> table ip nat
>> table ip mangle
>>
>> So probably there is something that is applying its policy but I
>> ignore what is.
>>
>> Can someone point me in the right direction?
>>
>> Thank you in advance.
>>
> Hi have not received any replies but I tried to investigate. After
> checking configuration files in my system I supposed that this could
> caused by a daemon, so I found that libvirtd push some rules.
>
> running virsh nwfilter-list I get:
>
> UUID Nome
> ------------------------------------------------------------------
> 34fe8cba-af99-4438-8efc-b135143425e2 allow-arp
> dc110112-3824-4cf3-946f-ba6e15cd29c3 allow-dhcp
> fecc383a-bab5-465d-a5be-98834fb626ce allow-dhcp-server
> 761e7132-8738-47c2-8101-275d6fd6a347 allow-incoming-ipv4
> d37b017f-8f21-4ad0-9fa6-052a5cb1ed2e allow-ipv4
> a8c740d5-328c-452e-bae7-9828c54f95b7 clean-traffic
> 296bdfad-11d9-4aa0-9817-4656ef2be6e5 clean-traffic-gateway
> 69215a61-bff5-482a-b913-589bb1ce18f2 no-arp-ip-spoofing
> 70c61f0a-c005-407f-843d-d13c2495f05d no-arp-mac-spoofing
> 386cd2f4-7272-43e2-ba1f-80cb3518649c no-arp-spoofing
> 9117fa21-e3d6-4c32-9cdf-af97ebd6599e no-ip-multicast
> 7a964470-4f74-4eef-9fec-a0e9a79e168d no-ip-spoofing
> 8c9e45a3-5d44-4641-b23d-eded5c1f1632 no-mac-broadcast
> 82dcd4f0-f55a-43ad-b520-d4c8d4bf37cd no-mac-spoofing
> bdd0ba54-7ce0-4a2c-9c25-c24072d364ba no-other-l2-traffic
> fc50783e-d32b-42ba-8380-7576c4388244 no-other-rarp-traffic
> edfc1bb3-b325-4f8d-8c5b-423e55da66eb qemu-announce-self
> 8556bd82-dc97-47b0-b573-5986ebbad3b2 qemu-announce-self-rarp
>
> If I will remove these libvirt filters I will get errors?
>
> Thank you in advance.
>
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