@stephenw10 Hi,
The WAN is fiber connexion for both of the internet connexion, the gateway monitoring is set the DNS of the provider.
When activating the 1 wan interface on the standby netgate, I get packet failed due to the CPU and then the load average growing up on the netgate. when i desactivate the WAN the CPU slow down, and all come back quietly.
I was thinking it coming from the switch part, and I reconstruct it on the second netgate, stil the same.
what i don't understand, is when i make a packet capture on the trouble wan interface, i get only broadcast from the LAN interface, ( no promiscious mode) and no VRRP , no connexion from IP public, etc..
All the wan is connected directly to the ISP router.
thanks