[FS#95] system looses IPv6 prefix after valid_lft reaches 0

[LEDE Bugs]

The following task has a new comment added:

FS#95 - system looses IPv6 prefix after valid_lft reaches 0
User who did this - Christophe (cp)

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The workaround for this is : 

echo 0 > /sys/devices/virtual/net/br-lan/bridge/multicast_snooping

It is an old bug (still present) in kernel 4.4.15 (at least)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=95#comment240