[FS#1002] Dns ipv6 problem when interface restart

[LEDE Bugs]

The following task has a new comment added:

FS#1002 - Dns ipv6 problem when interface restart
User who did this - forfree (freefor)

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As I posted in the forum thread, try attaching pcap from both router and PC.

Have you tried flashing a new build without keeping the configuration? SO you start from a clean config with just lan, wan and wan6? 
I can see that you have different interfaces so if possible you could give it a try.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1002#comment3435