2x Opnsense CARP HA VMs in one host

L

listhor

Member
Nov 14, 2023
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I’m trying to configure 2x Opnsense instances in high availability mode with carp vip interfaces on single pve host. I know it’s not full HA but I want software HA and also simply to test it.
VMs are connected through 2 bridges: 1 on WAN side, the other on LAN side (and further trunk physical link to switch).
IGMP snooping is disabled in (UniFi) switches.

But problem I’m facing is duplicated communication/data flow to and from both VMs; both instances have same looking graphs in webgui - network flow and also cpu. Despite they don’t change their master/backup status (no flapping at carp status) I have something similar to split brain situation, for example if I communicate with webgui or ssh on carp vip interface, reply comes either from one of those two and toggles every few seconds. If I ping them, reply is duplicated (“DUP!”). Communication to other hosts and WAN is ok.

I have already set Mac filter to “no” in VM’s firewall options (pve firewall is disabled). I tried ovs and Linux bridges with same results.
Is it possible to set it up correctly?
 
did you configure a "proxmox internal" isolated bridge for the private communication between the opesense (IIRC it's named pfsync in opensense doc) ?
 
Etienne Charlier said:
did you configure a "proxmox internal" isolated bridge for the private communication between the opesense (IIRC it's named pfsync in opensense doc) ?
Click to expand...
Yes, I forgot to mention that. There’s third bridge purely for pfsync. But issue (traffic duplication) is related to lan and wan bridges
 
What if I create additional LAN bridge for backup instance and instead of having them (2x opnsense) connected over single linux bridge - within proxmox, connect them over physical switch?
This of course requires second downlink:
  • master/regular bridge would remain connected as it is now
  • backup/new bridge will be connected to switch via additional downlink
Few running LXC containers would stay connected to master bridge. Would this work?
 
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