Re: Redundant Link without load balancing
the KB article names all steps perfectly. You should be fine if you follow that.
By default - that is, without 'config sys link-monitor' - the FGT has only the link status to determine if a line/port is down. This will not suffice in 99% of the time as the next, say, modem will always be up. Unless it itself dies.
So, if your failover doesn't work it's probably because you are not using link monitors, or if you do, they are misconfigured.
SD-WAN is a new feature which tries to combine all the necessary steps into one virtual interface setup. Basically, it's the same, with link monitoring etc. Additionally, SD-WAN can monitor link quality which previously was not possible. Quality in this sense is measured by latency or jitter (fluctuation in latency).
So yes, you could go ahead with SD-WAN for the sole purpose of WAN redundancy.
Ede " Kernel panic: Aiee, killing interrupt handler!"