Slowness on backup pfSense
I have two XG-7100 on 21.05.1-RELEASE configured as HA with CARP, and I'm having a weird problem. Accessing the backup pfsense on its own IP, no matter if it's the primary or secondary, is prone to connectivity issues, slowness, unresponsive webGUI, timeouts, frequent SSH disconnects, lots of TCP retransmissions and dup ACKs, etc... If I set the current master in CARP maintenance mode, this is now the one with the issues, and the new master is fine.
I can't seem to find a reason for such behaviour. Overall usage of ressources is low. The pfSync nodes are the same on both. The CARP failover itself is working. I completely wiped and reinstalled both on v21.05 from a USB stick. Same issue. I'm on a different VLAN than the management VLAN I use to access the pfSense; if that matters.
It looks similar to this post, but I don't have outbound NAT rules for 127.0.0.0/8 : post
Here's a pcapng of those TCP problems (10.1.0.2 is backup). Those issues come in bursts. It is not a switch or network problems because communication with everything else than the pfSense backup is good.
Backup Slowness Capture.pcapng
Have any idea? Thanks for your time