< #net.bridge.bridge-nf-call-arptables = 1
< #net.bridge.bridge-nf-call-ip6tables = 1
< #net.bridge.bridge-nf-call-iptables = 1
< net.bridge.bridge-nf-call-ip6tables = 0
< net.bridge.bridge-nf-call-iptables = 0
< net.bridge.bridge-nf-call-arptables = 0

Verify that the net.bridge.bridge-nf-call-iptables, net.bridge.bridge-nf-call-ip6tables, and net.ipv4.ip_forward system variables are set to 1 in your sysctl config by running the following command:

sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward

https://kubernetes.io/docs/setup/production-environment/container-runtimes/#install-and-configure-prerequisites

https://wiki.libvirt.org/Net.bridge.bridge-nf-call_and_sysctl.conf.html

• https://izsk.me/2021/08/18/Kubernetes-bridge-nf-call-iptables/