[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 - Ansuel (Ansuel)

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Here the dump from ifdown and ifup of wan_6

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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#comment3434