I´m using Link monitor on my T15 devices in combination with SD-WAN and also some places where there is 2 WAN links. My problem is i´m seeing quite a lot of Link Monitor missing ping replies like:
2020-11-05 16:37:59 link-mon [Link Monitor] No response received on External from Ping target 18.104.22.168 msg_id="4900-0002" Event
2020-11-05 16:38:08 link-mon [Link Monitor] No response received on NetGroup from Ping target default gateway msg_id="4900-0002" Event
This is on multiple T15 devices, running different fireware versions, connected to different vender equitment gateways (Cisco, SagemCom, Juniper), tried all sort of different ip addresses, and even bovpn vif with GRE, i see this "no response" from remote GRE ip address.
A PCAP shows missing reply to the Link-Mon pings at the same time where a diagnostics ping command from FSM to the same ip address, on the same outgoing interface show 100% success.
WG Support do not believe it´s a software bug, but i find it very odd only Link-Mon icmp replies "just vanish" but other pings to same destination works at the same time.
Of cause i can be wrong.
Anyway ... do any of you use Link monitor, and if so see issues with pings?