Why does my IPv6 over PPP stop working?

Joined
Oct 10, 2015
Location
China
My IPv6 works great after the first router advertisement... When it comes time for radvd to second a second router advertisement it dies and the route disappears from my routing table. In short, IPv6 works great for about 100 seconds and then it dies. I can't figure out why.I'm trying to setup IPv6 over IPv4 PPTPD. The entire /64 is dedicated to the single PPP interface. Any idea why it's not working? Thanks!
 
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