This is kind of newbie question... I googled about this scenario,\nbut with no results :(\n\nLets say I have fictivedomain.com registered with ns1.fictivedomain.com\n(10.20.30.1) and ns2.fictivedomain.com (10.20.30.2) that serve as\nPrimary DNS servers on machine #1.\n\nRecently I acquired machine #2 on completely different subnet and now I\nwant to setup ns3.fictivedomain.com (22.214.171.124) and\nns4.fictivedomain.com (126.96.36.199) on this machine #2, and I want them\nto serve as Primary DNS servers as well (I plan to shut down machine #1\neventually).\n\nSo far, I have:\n\n- installed MS DNS onto Win2003 SE\n- created ns3 and ns4 host names (Record Type A) with associated IP\naddresses (188.8.131.52 and 184.108.40.206) in fictivedomain.com host records;\n- Windows TCP/IP properties -> DNS server addresses are set to\n220.127.116.11 and 18.104.22.168;\n- MS DNS set to listen to all IP addresses (got 4 of them on machine)\n- created Primary Forward and Reverse Lookup Zones\n\nForward Lookup Zone screenshot:\n[URL]http://img151.imageshack.us/my.php?image=msdnsconfig1ni7.gif[/URL]\n\nReverse Lookup Zone screenshot:\n[URL]http://img166.imageshack.us/my.php?image=msdnsconfig2vh6.gif[/URL]\n\n- tested DNS with DNSTester and the results were okay (server responded)\n\nThe problem? When I try to modify DNS settings in client's .com domain,\nand enter ns3.fictivedomain.com and ns4.fictivedomain.com, it returns\nerror every time and values are not saved. If I try to enter ns1 or ns2,\nthen it goes trough...\n\nHope I didn't complicate it... Any help appreciated. Thanks!\n\nm.