proxmox firewall problem container bridges


Active Member
Apr 22, 2016
Hello everyone,

I have a problem with the proxmox firewall. i have activated it on the proxmox host and on all containers. all works fine. one container have no public ip-adress and use the proxmox host for dns resolv (internet access). if i activated the proxmox firewall on the container i can't connect to the internet or ping the proxmox host.

if i disable the firewall on the network card from the container i have access, but if i enable the firewall on the network card of the container i have no access to the internet or can ping something.

have andybody a idea or a solutions, would be very very nice!

my config on the proxmox host:

auto vmbr1
iface vmbr1 inet static
        bridge_ports none
        bridge_stp off
        bridge_fd 0
        post-up echo 1 > /proc/sys/net/ipv4/ip_forward
        post-up iptables -t nat -A POSTROUTING -s '' -o vmbr0 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '' -o vmbr0 -j MASQUERADE


  • fw.png
    6.8 KB · Views: 1


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!