Pimox7 Networking Issue

So I love Proxmox for my local lab and ever since I used them on my x86_64 nodes, I wanted the same experience for my Raspberry Pis as well. And it turned out that a very famous project by the name of Pimox7 is quite good at it as well.

My only issue after using the project was that networking was a bit off. I could i.e. get the VMs to work correctly over the bridge, but containers weren't working. After trying multiple solutions and incorrectly working configurations, I figured out the following.

In /etc/sysctl.conf add the following:

net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

Follow this addition by a sysctl -p from root user, and voila! Everything works as expected. Hope this post helps someone out!