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When I got a new connection from Ziggo last year I got an ipv6 adres, so they seem to have started to roll this out in the Netherlands as well.

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Depending on where you are in the Netherlands Ziggo will give proper Dual Stack or DS-lite to new customers. It reflects the networks that Ziggo was cobbled together from. If you are in a former UPC area you probably want to call them and ask them to downgrade you back to IPv4 (they do this for free). Their DS-lite solution employs carrier grade NAT which blows dog chunks.

Would that DS-lite solution explain why VPN connections to my AWS vps seem really spotty on ipv6 connections?

DS-Lite[0] means you have proper native IPv6 but only a tunnel on top of that for v4, so it's unlikely that IPv6 connections are negatively affected by this setup.

[0] https://tools.ietf.org/html/rfc6333

Edit: On the other hand, if connections via IPv4 were spotty I would not hesitate to suggest problems with NAT or path MTU.

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