@PetarV IP addresses are leased by the DHCP server for a given duration (decided by the DHCP server). I believe the Deco will count as "assigned" an address until its lease expires. If an address is...

@LVDX In "Router" mode, what was your IPV6 Internet Connection Type & method to get IPV6 address?

@pdlee This is a web site: test-ipv6.com. When you connect to that site via an Internet browser, it will display something. I suggest accessing that web site from one of your devices. And comparing...

@pdlee I was suggesting connecting to the test-ipv6.com site, once from a PC connected via the Deco (blocked by Seetickets), once from a PC connected to the modem (not blocked by Seetickets). And...

@Alexmesh I suggest testing the Ethernet port of the satellite Deco, by connecting a device to that port.

@pdlee To better understand the influence of the Deco, I suggest comparing, with and without the Deco, the response of this site: https://test-ipv6.com/