Trying to figure out isolated networks in Proxmox

[headcase]

I'm trying to figure out isolated networks in Proxmox, and am having trouble finding information on the subject. What I would like to do is create another bridge interface that is isolated, and can't talk to machines on other bridge interfaces. I have a interfaces file that looks like this:

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet static
        address  xxx.xxx.xxx.xxx
        netmask  255.255.255.128
        gateway  xxx.xxx.xxx.xxx

iface eno2 inet manual

auto vmbr0
iface vmbr0 inet static
        address  10.10.10.1
        netmask  255.255.255.0
        bridge-ports none
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address  10.10.11.1
        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 '10.10.10.0/24' -o eno1 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o eno1 -j MASQUERADE

Hosts on vmbr1 are able to ping hosts on vmbr0. How can I make it so that hosts on vmbr1 are isolated?

 

[Richard]

I'm trying to figure out isolated networks in Proxmox, and am having trouble finding information on the subject. What I would like to do is create another bridge interface that is isolated, and can't talk to machines on other bridge interfaces. I have a interfaces file that looks like this:

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet static
        address  xxx.xxx.xxx.xxx
        netmask  255.255.255.128
        gateway  xxx.xxx.xxx.xxx

iface eno2 inet manual

auto vmbr0
iface vmbr0 inet static
        address  10.10.10.1
        netmask  255.255.255.0
        bridge-ports none
        bridge-stp off
        bridge-fd 0

auto vmbr1
iface vmbr1 inet static
        address  10.10.11.1
        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 '10.10.10.0/24' -o eno1 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o eno1 -j MASQUERADE

Hosts on vmbr1 are able to ping hosts on vmbr0. How can I make it so that hosts on vmbr1 are isolated?

If hosts on vmbr0 can reach those on vmbr1 and vice versa depends on the routing configuration in the VMs. If you want to avoid it categorically activate a firewall which does not allow connections between vmbr0 and vmbr1.