WAN Redundant - Link-Monitor not right working?
it's my first post.
We have implemented with our Fortigate 60E WAN redundant.
The primary ISP is fiber and the secondary is LTE.
All traffic should go through the WAN1 interface.
In general, failover works from WAN1 to WAN2 or WAN2 to WAN1.
Now I have something strange observed:
In Germany, an automatic reconnect is performed every 24 hours. Unfortunately, this can not be avoided.
If the reconnect takes place or I perform it manually, then the WAN1 is for max. 3 seconds unreachable. After 3 seconds, it runs again and stable.
After 15 minutes, the failover to WAN2 is done and the traffic goes over it. (WAN1 works 100%)
Then after 3 minutes, switch back to WAN1.
If I disable WAN2 before the i performed a manual reconnect, then the above behavior does not happen. BUT:
If I activate WAN2 after 20 minutes, then it takes a few minutes and it will again fail over to WAN2.
After 3 minutes back to WAN1. Although my link monitor has the values failtime 15 minutes and recoverytime 3 minutes, but the question is:
Why is the failover performed when WAN1 is gone for only 3 seconds after a reconnect and is then permanently stable?
Is my link monitor configured correctly?
config system link-monitor
set srcintf "wan1"
set server "220.127.116.11"
set interval 60
set failtime 15
set recoverytime 3
set update-cascade-interface disable