2 network interfaces in one VM doesn't work

[Miroslav]

Hi *,
I have one question regarding 2 network interfaces in one virtual machine. I created Oracle Linux VM like in the picture:



I have 2 physical interfaces on the machine running proxmox 3.0-20. First one uses vmbr0 and second uses vmbr1.
This is my /etc/network/interfaces setup:
auto lo
iface lo inet loopback

auto vmbr0
iface vmbr0 inet static
address 10.50.61.23
netmask 255.255.252.0
bridge_ports eth1
bridge_stp off
bridge_fd 0
up ip route add 192.168.99.0/24 via 10.50.60.1 dev vmbr0
down ip route del 192.168.99.0/24 via 10.50.60.1 dev vmbr0
up ip route add 10.0.0.0/8 via 10.50.60.1 dev vmbr0
down ip route add 10.0.0.0/8 via 10.50.60.1 dev vmbr0

auto vmbr1
iface vmbr1 inet static
address 192.168.0.20
netmask 255.255.255.0
gateway 192.168.0.36
bridge_ports eth2
bridge_stp off
bridge_fd 0

I have few virtual machines, on some of them I have configured either communication over vmbr0 or vmbr1, but cannot configure to use 2 interfaces on one VM.
The problem is I cannot see 2 network interfaces in the VM Linux machine, only first one:
# ls /sys/class/net
eth0 lo
# ifconfig -a
eth0 Link encap:Ethernet HWaddr BF:10:xx:xx:xx:xx
inet addr:192.168.0.25 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::bc16:53ff:fe71:118/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:22146 errors:0 dropped:0 overruns:0 frame:0
TX packets:1475 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2063340 (1.9 MiB) TX bytes:181241 (176.9 KiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

I will apreciate any hint, thank you in advance!

Best regards,
Miroslav

 

[sgtfoo]

VMs don't automatically use both bridge interfaces (vmbr#).
In the web GUI, manually add the second network interface to the VM (while it's down) and be sure to specify which vmbr# you wish to use.
Then boot the VM and it should see the new interface.

 

[Miroslav]

Hi sgtfoo, thank you a lot! You helped me very much.It works. So this means, if you have live system you cannot add second interface, without reboot.