This is of course incorrect. The whole point of having amprgw is to be able to communicate between 44net and internet without having to use NAT. But indeed it is true that for amprgw and some other gateways to transport your traffic between internet and 44net you need to have a DNS entry for each of your addresses. And it is also true that you should have a careful look at your firewall when you are not used to having systems "directly on the internet" without the implicit firewalling provided by a NAT router. Rob