Assume the attached infrastructure. From C and D I can go anywhere, however from A and B it's like I couldn't see beyond the DD-WRT, in fact, I can't ping the DD-WRT. This is a "problem" because when A and B want to use the printer, they have to switch to the AP of the DD-WRT.Before I had the same setup, but the other way around (and other ISP router), ISP router was at the right and DD-WRT at the left, and both were linked by wifi using the Repeater Bridge mode, and there wasn't any problem at all. I can't use this setup anymore due to the switch from ADSL to fiber.Right now I'm out of ideas, really can't figure out what is the problem. Checking DD-WRT's documentation, Linking Routers - DD-WRT Wiki, everything seems fine.