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Hi Bobmc, Actually I am trying to set up a small Slurm cluster on top of these hosts. There will be several VMs in each hosts (not just 1) and they are required to communicate with each other. Does it mean if there communication are limited to only several ports. I think yes in this case.

The hosts are sitting in a sever room and I don't have any access to the switches. Maybe I need to talk with the staff there.

Hi mvs, thanks for your suggestions. I tried the vlan over bond0 method and modified the interface files as suggested. But the VMs cannot ping each other yet. Actually the 2 proxmox hosts cannot ping to each other's internal IP addresses yet. # ping -c 3 10.9.16.101 PING 10.9.16.101...

Hello community :) I have a cluster with 2 Proxmox nodes, which are hosting some VMs on their own. The two hosts are in the same network (172.21.251.0/24), and connect to the switch using LACP (802.3ad). The hosts also have a network bridge (vmbr0) connected to a private network...