[FS#73] Router doesn't answer to ping to ff02::1

[LEDE Bugs]

The following task has a new comment added:

FS#73 - Router doesn't answer to ping to ff02::1
User who did this - Jo-Philipp Wich (jow-)

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Your proposed patch might solve this specific issue but it does not fix the fundamental problem that it is impossible to configure rules dealing with "wanted" invalid packets. I wanted to pursue the more generic approach of not propactively dropping possibly legit packets just because conntrack cannot not handle them.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=73#comment312