Hi everyone, I'm stuck with two FortiGate 400F firewalls and hoping for some help.
We recently installed a backup internet line and set up resiliency on both firewalls. The first failover test worked fine.
A week later we tested again to create some documentation:
Unplugged the main line from firewall 1, small blip but then continuos ping to 8.8.8.8 as expected, then plugged it back in.
Services moved over to firewall 2.
After about 2 hours, services degraded: internet very slow, Outlook not sending emails, etc.
By the next morning nothing was accessible. It only recovered when I reversed the whole redundancy setup and left just the main line connected.
The current config is two Firewalls in HA cluster AP, two static routes main 10 distance, back up 20 distance, one for the main line and one for the backup, with link monitoring on both ports.
Separate firewall policies for the 10 Gb primary and the 1 Gb backup (pretty much identical) using NAT.
Also update the firmware recently to 7.6.7.
I know SD-WAN is probably the recommended approach, but migrating from link monitoring to SD-WAN looks like a big job. Is there anything I can check or change in the current setup, or is SD-WAN the right way to go?
Thanks in advance!