[SOLVED] Direct Connect Two VMs in Proxmox

[FallCWB]

Hello everyone,
I'm creating a small network to train SDN and on it I'm making one of my VM into a switch, the problem that I'm having is that I'm not able to connect two NIC.
What I have done is to create a separated bridge (vmbr 1) and putted each card in a different vlan tag. This worked, I can have communication between the machines but the problem is that the vmbr re-encapsulates making me lose information.
TL;DR: there is any way using proxmox to create a "virtual cable" that connects two vms together? Like I would connect two real machines with a single cable?

PS.: I tought about change the vmbr into a hub but I don't know how to do that.

Thank you,

 

[FallCWB]

Update:
The word I was looking for was: point-to-point connection.
Is it possible to create a point-to-point connect between two VMs?

 

[Stoiko Ivanov]

On possible option (which works via GUI) would be to create a bridge for each point-to-point connection and plug in the endpoints (VM NIC for VM 1 and VM 2) into that bridge

I hope this helps!

 

[FallCWB]

On possible option (which works via GUI) would be to create a bridge for each point-to-point connection and plug in the endpoints (VM NIC for VM 1 and VM 2) into that bridge

I hope this helps!

Thank you Stoiko, I tried it and it works but for what I'm doing it didn't work.
My main problem is that the NICs should not pass trough an bridge.
Any ideas?

 

[Stoiko Ivanov]

My main problem is that the NICs should not pass trough an bridge.

this is not possible with PVE's tooling.
* you could create wireguard tunnels between all your vm's (and use those as 'cable')
however I'm not sure where the passing through a bridge (containing only the 2 VM's ports) is causing problems?

PS.: I tought about change the vmbr into a hub but I don't know how to do that.

this can be done by setting the ageing parameter on the bridge (see `man brctl` and `man ifupdown-addons-interfaces` (ifupdown2))

I hope this helps!

 

[FallCWB]

Hello eveyone, I found a solution that solved my problems, I used VXLAN on the VMs with OvS and it solved the issues.
Thank you Stoiko.

 

[Stoiko Ivanov]

Thanks for sharing your solution!