@Kevin_Z Can you provide a link for the MR400 v1 beta firmware?

Okay, so I contacted the Tele2 support now and according to them you need to use a router/modem provided from them to not get stuck behind their NAT. My backup router is a model they stocked before,...

@nu1mlock Fair enough, but then what suddenly killed services like YouTube/Netflix etc.?

From what I gather the MR400 should work if we can enable ipv6-tunnelling, however my router claims no WAN-connection is available when I try to set it up with these settings:...

@nu1mlock Sure thing, you can't buy it anymore but it's a Huawei E5172. The CG NAT sounds plausible, but if that's the case why did the MR400 work fine for months up until the beginning of December?

@nu1mlock The Huawei router doesn't have multiple ethernet ports, and therefore no NAT. That's what makes me think it's a NAT issue from Tele2s side. If I have the time I'll give them a call tomorrow...