Filtering multicast and/or 6to4?

Quartz quartz at
Wed Mar 22 18:03:43 UTC 2017

So I've tried asking this on -net a couple times, but they're completely 
ignoring me for whatever reason, so I guess I'll try here instead.

After all these years, I'm still not 100% sure I understand multicast 
and 6to4. I'm trying to figure out when/why/if I should be filtering 
stuff, and in which direction(s). Is there anyone here who's familiar 
with this who might be able to help?

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