Sorry, I thought you were asking about a home broadband connection with the typical basic router supplied by the ISP. The UDB Pro looks like something for a sm

Sorry, I thought you were asking about a home broadband connection with the typical basic router supplied by the ISP. The UDB Pro looks like something for a small/medium business, so you presumably have a business connection. You'd need to ask your ISP for the configuration, as it will depend on what service they're providing. (Just like for IPv4 you'd need configuration if the ISP is providing you with 4, 16, 32, ... IPv4 addresses -- also a common situation.) If ifconfig is showing IPv6 addresses starting with fe80:, these are local/private, a bit like 169.254.x.y IPv4 addresses. So far, all global/routable IPv6 addresses begin with 2. (And for most home users, IPv6 is just as easy as IPv4, i.e. they don't know anything about either. After a test period, ISPs that support IPv6 generally enable it for all the normal home users -- it saves them money! That it is the default is how we got to 35% of Internet users using IPv6.)