[PVE-User] Is it possible to assign both eth0 and eth1 or vmbr0 and vmbr1 to a VM?

[Justa Guy]

I'm probably the least qualified to answer this, since I'm learning this
stuff too. I'll give it a shot.


I don't think that's possible.

For example this drawing is what I think you're describing, and it will
absolutely fail:

|------|     |------|
| eth0 |     | eth1 |
|------|     |------|
    |           |
    |           |
|-------|   |-------|
| vmbr0 |   | vmbr1 |---|
|-------|   |-------|   |
    |           |       |
    |           |       |
|------------------|    |
|                  |    |
|       bond0      |    |
|   active-backup  |    |
|                  |    |
|------------------|    |
          |             |
          |             |
|------------------|    |
|                  |    |
|       vmbr3      |    |
|                  |    |
|------------------|    |
          |             |
          |             |
          |             |
   |------------| |-----------|
   |            | |           |
   | redunudant | |    non    |
   |     VM     | | redundant |
   |            | |    VM     |
   |------------| |           |
                  |-----------|



You can have a bond0 be in active-backup mode, but you can only give it
eth0 & eth1 as slaves.

You can't have a bond with vmbrs as slaves, only eths.



In the web gui's 'System' tab you add can a bond to your interfaces,
then make a bridge to the bond so the VMs can reach it.

In the VM's 'Hardware' tab you add the bridge(s) to the VM's interfaces.





So with just 2 interfaces I think you can have either redundant
WAN-only, or redundant private LAN-only.

Or you can have 1 WAN & 1 private LAN.




Maybe a vlan can let you use eth1 twice, once for the backup WAN & again
for the private LAN.

I don't know if a bond can be applied to a vlan for redundancy, I think
just interfaces.



Definetly keep asking, since I'm very early at learning this and am
likely wrong.
Someone else probably knows a better way.


-C






On Tue, 16 Nov 2010 14:00 -0500, "Bruce B" <bruceb444 at gmail.com>
wrote:

  Hi Everyone,



I have a Cisco switch that is set in vLAN mode. The server that
is connected to the switch also has two NIC cards (eth0 and
eth1). Currently vmbr0 is bridged with eth0 and vmbr1 is bridged
with eth1. Each of the eth0 and eth1 are connected to different
vLAN of the cisco switch so they effectively pickup
a different subnet IP address. [1]192.168.0.0/24 and
[2]192.168.5.0/24.



I have all of my VMs and KVMs using vmbr0 but as a back and as a
secondary internal system I want to use vmbr1 (eth1) on a VM
simultaneously with vmbr0. Is that possible? I have searched
through the GUI but I only see a drop down menu for vmbr0 or
vmbr1 so there is no option to add both.



I still want to use vmbr0 for public traffic in and out but vmbr1
will serve my private network needs.



I appreciate some input on this. I am new to Proxmox; please
detail your answer a bit.



Thanks

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References

1. http://192.168.0.0/24
2. http://192.168.5.0/24