[FS#4128] ipv6 broken on Xiaomi Redmi AC2100 (Attachment added)

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - ThomasCr (ThomasCr) 

Attached to Project - OpenWrt/LEDE Project
Summary - ipv6 broken on Xiaomi Redmi AC2100
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - hoch
Priority - gering
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Most of my clients can't connect with my dual stack internet connection with IPv6.

I tested now a lot, but cant get it working on my Xiaomi Redmi AC2100.

When I ping outside (eg. to google.com) with IPv6 I never get a answer back.

When I run tcpdump on the Gateway running OpenWRT 21.02 (tested now with rc4 to .1) I see the packets leaving the wan interface and I also see the answers on the wan interface.

But the answers don't come back to the lan interface.

I tested to enable/disable source based policy routing
I tested to enable/disable network.globals.packet_steering

I also have flow offloading switched off!

First I was thinking, is works with windows, but this seams just we random - what is working and what not... now it is also not working on my windows - where it was working before (the screenshots come from that installation)

The problem is also reported to the forum at https://forum.openwrt.org/t/ipv6-issue-with-dsa/107138


One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4128

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