[FS#1088] PPPoE session breaks under heavy WAN load traffic, losing IPv6 connectivity.

[LEDE Bugs]

The following task has a new comment added:

FS#1088 - PPPoE session breaks under heavy WAN load traffic, losing IPv6 connectivity.
User who did this - forfree (freefor)

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Now with SQM set at 80% of my DOWN/UP I don't have pppoe session drops.
With the old build it was stable without SQM or with SQM set at 85%.
What else could I check when my WAN link is fully stressed? 
Memory usage is stable and there are no peaks.

Thanks.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1088#comment3671