Direct network connect between 2 VM

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cbitconquer

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Feb 24, 2020
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Hello,

I need to connect 2 virtual machines directly through a "virtual network cable" without using a switch. Is this possible in Proxmox?

Thanks in advance,

C.
 
Yes this should work:
* create a new bridge on the PVE node (without attaching a physical interface) (e.g. vmbr1)
* add one network interface to each guest, which is connected to this bridge
* configure your IPs inside the guest

I hope this helps!
 
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Thank you for replying: I forgot to mention that my two guests are in 2 different pve nodes mounted on a cluster
 
"how do you want to do that without any switch ?" - do you mean "physical switch", attaching a physical network card to a virtual bridge?

"do you have an example with another hypervisor ? " - this is my doubt, if it is possible (I'm a rookie in Proxmox)



Perhaps creating a bond and assigning different VLANS?
 
>> "how do you want to do that without any switch ?" - do you mean "physical switch", attaching a physical network card to a virtual bridge?

I just comment your first question ;)
"I need to connect 2 virtual machines directly through a "virtual network cable" without using a switch"


>> Perhaps creating a bond and assigning different VLANS?

what is your problem exactly ? do you want to isolate traffic of theses 2 vms from the others vms ?
 
Thank you for reply:

I have 2 NAS-s into 2 pve nodes(in cluster) and inside those Nas-s with own software want to create a cluster. One of the requisites is to direclty connect those Nas-s between the secondary network adpaters(heartbeat connection)
 
ok, so it's really depend if you have free physical nic port.

if you have physical nic port, you could use a cross-cable between your 2 nodes,

-then create a vmbrX on each node, and add the vm interface hearbeat on it.

or could also passthrough the physical nic in the vm,instead using the vmbrX, but maybe it's a little bit overkill


if you don't have free physical nic port, you need a vlan indeed. (but generally, the hearbeat link should be on another network)
 
spirit said:
ok, so it's really depend if you have free physical nic port.

if you have physical nic port, you could use a cross-cable between your 2 nodes,

-then create a vmbrX on each node, and add the vm interface hearbeat on it.

or could also passthrough the physical nic in the vm,instead using the vmbrX, but maybe it's a little bit overkill


if you don't have free physical nic port, you need a vlan indeed. (but generally, the hearbeat link should be on another network)
Click to expand...

I'll have a look: thank you very much
 
If your PVE nodes have fault-tolerant network interconnection (a real fault-tolerant cluster always should), you will not need any special setup for VMs. If the software (technically) requires two different NICs, just add two there.
 
Stoiko Ivanov said:
Yes this should work:
* create a new bridge on the PVE node (without attaching a physical interface) (e.g. vmbr1)
* add one network interface to each guest, which is connected to this bridge
* configure your IPs inside the guest

I hope this helps!
Click to expand...
sorry for necro :)
found this thread via google so i wanted to add that if you want the host to also be able to interconnect with the lxc / vm you have to set an IP to the interface.

So for example if you have :
pve vmbr1 10.0.0.1/24
lxc1 vmbr1 10.0.0.2/24
vm1 vmbr1 10.0.0.3/24

if you configure it like Stoiko Ivanov said you only have guest to guest communication
if you give the host an address you also can have host to gues / guest to host communication as well ( :
 
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