[SOLVED] PVE Cluster change/replace NIC


Jul 15, 2016

i just replaced the NIC's on all my 3 nodes and i upgraded to 10 Gbit's SFP+.
All nodes can access each other over ssh without any problems.
But since i replaced the NIC's im not able to access the nodes at the web GUI or at least node1 cannot access node 3 or node 2 anymore.
I only see the loading circle with the message "communication failure (0)", why that?
Is corosync somehow fuzzing around with the new MAC address here?

My cluster state seems to look fine:

pvecm status
Cluster information
Name: cluster
Config Version: 3
Transport: knet
Secure auth: on

Quorum information
Date: Sat Jan 18 21:16:47 2020
Quorum provider: corosync_votequorum
Nodes: 3
Node ID: 0x00000003
Ring ID: 1.2f8
Quorate: Yes

Votequorum information
Expected votes: 3
Highest expected: 3
Total votes: 3
Quorum: 2
Flags: Quorate

Membership information
Nodeid Votes Name
0x00000001 1
0x00000002 1
0x00000003 1 (local)

lspci | grep -i eth
01:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
23:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)


It also seems im not able to get any "high-bandwidth" trough the adapter:

root@hv01 ~ # iperf -c -p 5001
Client connecting to, TCP port 5001
TCP window size: 85.0 KByte (default)
[ 3] local port 52050 connected with port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.2 sec 109 KBytes 87.3 Kbits/sec


ISSUE Solved (MTU size was not fine for the new adapter)

What can i do ?
Last edited:
May you please post what it took to get it resolved?


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!