@tttg Better contact Optus. They will tell you if your modem is compatible with their service and how to set up your AX55 Internet connection type.

@Guima_br I would suggest to open your own thread for more clarity on your request. If your ISP modem is not in bridge mode the AX73 and RE505x would see each other without setting a route in the ISP...

@Ricov40 If you plan to extend your Archer A6 guest network in a mesh with a range extender, this won't work. You can extend a guest wireless network only in a regular range extender mode - check...

@AJPC That's possible but not recommended:

@diego504 Both AX53 and C6 v4 support Easymesh (Onemesh successor) and you should be able to achieve the topology in question. Whats more, you could connect AX53 and C6 v4 by an ethernet cable and...

@Wociech Trying some other quality made ethernet cables would be a good idea. Before addressing this with your ISP you could roll back to the previous FW release to rule out the new FW release issue.