Problems with network configuration

[Maliu]

Hello,

yesterday i bought my license key for Proxmox. All works fine only the network configuration is very complicated. When i want to start my vmbr0 bridge i receive the following error:

ifup vmbr0
Cannot find device "vmbr0"
Failed to bring up vmbr0.

This no longer works after a reboot. The reboot was yesterday night. My interface looks like this:

cat /etc/network/interfaces


# source /etc/network/interfaces.d/*




auto lo
iface lo inet loopback


auto eth0
iface eth0 inet static
            address  84.200.50.186
            netmask  255.255.255.248
            gateway  84.200.50.185


auto vmbr0
iface vmbr0 inet static
            address  84.200.50.187
            netmask  255.255.255.248
            gateway  84.200.50.185


auto vmbr1
iface vmbr1 inet static
        address  84.200.50.188
        netmask  255.255.255.248
        gateway  84.200.50.185

Has anyone an idea? :-(

 

[tom]

there is no NIC assigned to the bridge.

a default ISO installed network looks similar to this (of course, according to your network):

root@pve:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto vmbr0
iface vmbr0 inet static
        address 192.168.2.204
        netmask 255.255.240.0
        gateway 192.168.2.1
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

 

[Maliu]

Thank you for your fast reply and help. I fixed this but now i get another error

ifup vmbr0

Waiting for vmbr0 to get ready (MAXWAIT is 2 seconds).
RTNETLINK answers: File exists
Failed to bring up vmbr0.

cat /etc/network/interfaces


# source /etc/network/interfaces.d/*




auto lo
iface lo inet loopback


auto eth0
iface eth0 inet static
    ​        address  84.200.50.186
            netmask  255.255.255.248
            gateway  84.200.50.185


auto vmbr0
iface vmbr0 inet static
            address  84.200.50.187
            netmask  255.255.255.248
            gateway  84.200.50.185
            bridge_ports eth0
            bridge_stp off
            bridge_fd 0

 

[dietmar]

Please remove that whole eth0 configuration from your config (eth0 is configured as bridge port instead).

 

[Maliu]

Please remove that whole eth0 configuration from your config (eth0 is configured as bridge port instead).

Thank you. I changed eth0 to dhcp. Now the server and the virtual machines are online and available - strange. I configured vmbr1 and when i want to start vmbr1 with "ifup vmbr1" i receive

device eth0 is already a member of a bridge; can't enslave it to bridge vmbr1.

Waiting for vmbr1 to get ready (MAXWAIT is 2 seconds).
RTNETLINK answers: File exists
Failed to bring up vmbr1.

But vmbr1 (and the IP) is online.

 

[dietmar]

Thank you. I changed eth0 to dhcp.

Again, you need to remove any IP config from eth0 (also remove dhcp). The device is used as bridge port, so you may not assign an IP address.

 

[Maliu]

Hm ok but where i configure eth0 because when i deconfigure eth0 then the hostsystem have no connection to the internet anymore.

 

[dietmar]

Hm ok but where i configure eth0 because when i deconfigure eth0 then the hostsystem have no connection to the internet anymore.

You configure the bridge instead (vmbr0).

 

[Maliu]

You configure the bridge instead (vmbr0).

Thank you I changed this now. The vm is online but the hostsystem is offline. My Configuration now:

=> http://screenshot.mati-media.de/screenshot18-56-45.png (interfaces - I've commented out eth0)
=> http://screenshot.mati-media.de/screenshot18-58-18.png (route -n)

Installed is Debian 8 with the newest Proxmox Version.