Dynamic IPv6 prefixes / dynamic DNS / VPN: Handling via NPTv6?

[iam]

Using 64:ff9b::/96 could have similar problematic side effects like when using .local as internal DNS TLD. I will stick to ULAs.

[iam]

NPTv6 seems to break TLS 1.3 Hybridized Kyber Support in Chromium. Any idea why?

[iam]

Sorry seems not to be NPTv6 alone. This suggest the WAN MTU (PPPoE) the cause:

https://issues.chromium.org/issues/336007383

In the NPTv6 setup without PPPoE it works. In case of other questions I will open an other thread.

EDIT: I confirm that setting MSS on LAN to 1452 fixes the issue.

EDIT2: NPTv6 probably has nothing to do with it. I had tested it in the guest WiFi with public IPv6. But I just guess that the WiFi has an effect on the MTU problem.

[bimbar]

Is this an IPv6 problem or do you also experience this with IPv4?

[iam]

I don't know. I've experienced this with chromium (IPv6) only but not with Firefox (IPv4). But Hybridized Kyber Support was not enabled in Firefox.