docs: def _get_ipv6addrs(self):
          """
          Returns the IPv6 addresses associated with this NIC. If no IPv6
          addresses are used, empty dict is returned.
          """
          addrs = self._get_addrs()
          ipv6addrs = addrs.get(netifaces.AF_INET6)
          if not ipv6addrs:
              return {}
          return ipv6addrs[0]