listen * 8000
{
  remote: www.google.at 80;
  remote-resolv: ipv6;
  source: 2a02:3e0:2002:1:218:deff:fe03:ed;
};

listen 2a02:3e0:2002:1:218:deff:fe03:ed xmpp-server
{
  remote: www.google.at www;
  remote-resolv: ipv4;
};