@Bruce518 your plan should work fine. I have a similar configuration on my ER605. I have a PPPoE connection to my ISP and an OpenVPN server running to allow me remote access to my LAN from my laptop...

@Arkasia check the MAC address of the WAN interface on the c7, then set the MAC on the ER605 WAN interface to be the same. Its possible that your ISP is checking the mac address of the router making...

@colt83 You might find this https://www.tp-link.com/us/support/faq/3363/ useful. Although Ive no direct experience of Openvpn, I tend to use IPSEC which wont work in your configuration. However I...

@PaulVisco Check that 'IP Statistics' isnt enabled. Its on the Status->Traffic Statistics->Ip Statistics page. If that's enabled it will cause high cpu usage at higher speeds

@RajanGarg since you are effectively trying to access the AX10 from the WAN, you will need to enable remote management https://www.tp-link.com/us/support/faq/1553/

@djsdjs Make sure that 'IP statistics' is disabled. Its under the 'Status->Traffic statistics' menu. ISTR that its enabled by default and can cause high CPU usage. Also check that Bandwidth control...