proxmox firewall problem container bridges

[OliverB]

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
        address  192.168.30.254
        netmask  255.255.255.0
        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 '192.168.30.0/24' -o vmbr0 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '192.168.30.0/24' -o vmbr0 -j MASQUERADE