@AjaySharma Have you tried DMZ? It seems like the port forwarding rules you set on the ER605 has problem, maybe.

@oqix As I know, the SFP port connected/disconnected information couldn't be shown in the log on the controller. If you wanna check it, you can use SNMP or SSH.

@pepijndevos If you delete ACL rules and set them again, will it fix? You can reboot these devices to have a try, maybe it works after a reboot.

@araj10289 As I know, IPv6 doesn't support failover yet.

@Fleegle61 What is the version of your controller? If it is V5.7, take a look: What Is Going On About the Broom Icon On the Controller? (Having recently discovered the treasure section in this...

@KamranBukhari In my opinion, it is OK, because CPE has AP Router mode and WISP Client mode, both can be a router. Check this: How to Select Operation Mode of Pharos Series Products?