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by buro9 2143 days ago
These ISPs are using DS-Lite, Dual-Stack Lite.

https://www.juniper.net/documentation/en_US/junos/topics/top... (this isn't a purely Juniper thing, but they have nice diagrams on their documentation)

It's a kind of carrier grade NAT with 4over6 baked in.

Depending on the version of this they are relying on your modem to perform encap/decap of 4to6, hence when you switch to modem mode or your own router you fall back to what the network truly is... v4.

This is what the knuckle draggers at Virgin Media are contemplating apparently.

In the UK the best option for IPv6 is https://www.aa.net.uk/ but unfortunately for me the DSL speed in my area is pretty bad due to being a few KMs from the exchange.

The alternatives to all of this is to run your own Wireguard instance elsewhere on a v6 network, and tunnel the entire home network to it.
4 comments
Dagger2 2143 days ago
DS-lite gives you a v6-only internet connection. v4 is provisioned as a service over the top of that, using a tunnel between your router and a server inside the ISP. The underlying network is v6, so a router without DS-lite support will only get v6 (which will generate support calls because "your router must support DS-lite" is too complicated for many people to understand).

My guess is that turning on bridge mode also migrates you from the ISP's newer DS-lite service to their older v4-only one. This is unfortunately common in DS-lite deployments; ideally the old service would also have v6 so that you aren't forced to choose between v6 and non-CGNATed v4.

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tialaramex 2143 days ago
> unfortunately for me the DSL speed in my area is pretty bad due to being a few KMs from the exchange.

For VDSL the distance to an exchange shouldn't matter. The copper runs to a green box in the street, then another newer-looking green box nearby (or in some cases attached) with fibre in it takes the VDSL signal - and only old-school voice line conversations go to the exchange.

So definitely if previous ADSL speeds were poor it's time to check again. If you just meant that as shorthand then no worries, but I've run into way too many people who have the idea that all DSL is the same.

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Jonnax 2143 days ago
IDnet does IPv6 and give you a /48.

I was on them for a year great service.

I'm now on Hyperoptic which also does IPv6.

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oarsinsync 2143 days ago
BT and Hyperoptic both also provide native IPv6 in the UK

Hyperoptic will give you a globally unique IPv4 address for an extra £5/month, and otherwise will stick you behind their CGN.

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