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Wireguard ipv6 Guest on 13th August 2021 10:12:47 PM
  1. An upstream change seems to have introduced this issue to (at least) debian based distributions.
  2.  
  3. I found that trying to start a Wireguard connection that included an ipv6 address started failing with the error:
  4.  
  5.  
  6. [#] ip -6 address add -redacted-/64 dev config_name
  7. RTNETLINK answers: Permission denied
  8.  
  9. A solution that worked was editing /etc/sysctl.conf to add:
  10.  
  11. net.ipv6.conf.all.disable_ipv6 = 0
  12. net.ipv6.conf.default.disable_ipv6 = 0
  13. net.ipv6.conf.lo.disable_ipv6 = 0
  14. Followed by reboot or just:
  15.  
  16. sudo sysctl -p

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