What were you trying to do that didn't work?

I'm trying to enable RHEL/CentOS 10 tests for cockpit-machines. Starting default libvirt network. This breaks all tests.

Please provide the package NVR for which bug is seen:

kernel-core-6.9.0-0.rc2.1.el10.x86_64
libvirt-daemon-config-network-10.0.0-3.el10.x86_64
iptables-libs-1.8.10-7.el10.x86_64
iptables-nft-1.8.10-7.el10.x86_64
nftables-1.0.9-3.el10.x86_64
python3-nftables-1.0.9-3.el10.x86_64

How reproducible: Always

Steps to reproduce

virsh net-start default

Expected results

network starts

Actual results

error: Failed to start network default
error: internal error: Failed to apply firewall rules /usr/sbin/iptables -w --table filter --insert LIBVIRT_FWO --in-interface virbr0 --jump REJECT: Warning: Extension REJECT revision 0 not supported, missing kernel module?
iptables v1.8.10 (nf_tables): RULE_INSERT failed (No such file or directory): rule in chain LIBVIRT_FWO