With my old O2 setup, I had the old router set to bridging mode which basically turned off all the router features and left it as a simple modem, allowing the Apple Time Capsule to do all the routing / NAT etc. I also think that the Time Capsule accessed the O2 network using PPPoE because of the bridging from the modem.

Time Capsule in bridge mode with Linksys | MacRumors Forums Oct 09, 2009 Apple Time Capsule Review, Is It Still Great? The Apple Time Capsule 2TB and its bigger brother the Time Capsule 3TB works great with Time Machine. Time Capsule is also excellent as a Wifi base station, thanks to its 802.11ac Wifi networking. And there is nothing to stop you getting a second Time Capsule. Then you can daisy chain them for extra backup and file storage. Apple Time Capsule, PPPoE, Bridging the Thomson Ro

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Put your time capsule in bridge mode and turn networking off. Then connect it via ethernet to the Velop. That way it just acts as a server for your backups. You won't want the time capsule to do any of the networking. Answered by Avery H from Madison; Jan 16, 2018 Flag as inappropriate Answer 1 Update for Apple Airport Extreme and an Apple Time Capsule

Next, select the ‘Network’ tab. Under the ‘Router Mode’ drop-down, select ‘Off’ (Bridge Mode). This setting means that IP address assignment is passed onto your eero, which you’ll connect as your primary router. Once done, press ‘Update’ and your Time Capsule or Extreme will reboot and save your changes.

I have a Time Capsule and rely on Time Machine to - Apple