@wyutrades Look at this: Solution to ER605 V1 1.3.0 Firmware Got Many Logs of "TCP no-Flag attack" Issue

@wannaknow Uhm... It seems like not a tp link camera but the TSL camera.

@MhAlex Why don't you set Site-Site IPsec VPN between 2 ER605? Take a look: How to configure LAN-to-LAN IPsec VPN

@JavierMega Hi, did you test the cables within your network? Have you tried to reset the switch and test it again?

@Misbahu Hi, ER7206 is a good choice. https://www.tp-link.com/business-networking/omada-sdn-router/er7206/#specifications

@IamMurphy You may have misunderstood on Link Backup function, check this. Please note that during the effective time, Backup WAN will be online and Primary WAN will be offline. At other times,...