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Your suggestion seems to be completely workable. Thanks Dave. Firm. From: Graff, Dave [mailto:[log in to unmask]] Sent: Tuesday, March 10, 2009 12:58 PM To: Charlot, Firmin Subject: RE: Atomic Time Clock question Is it absolutely essential that these computers be on a physically separated network? It seems like you could run these computers behind a firewall/NAT/proxy/whatever that only allows UDP 123 outbound and nothing inbound which would get the job done without that added hardware costs of an atomic clock. So long as the management options are only accessible from behind this border device, the security risk should be effectively zero. From: Charlot, Firmin [mailto:[log in to unmask]] Sent: Tuesday, March 10, 2009 10:56 AM Subject: Atomic Time Clock question We have a few servers that we would like to keep off the network <no physical path to the outside world) but would like to sync time somehow. We are thinking about an Atomic Time Clock (getting its time from radio signal) that's equipped with an Ethernet port and an NTP server. Any comments, questions and suggestions are welcome. Thanks. Firmin Charlot, ITIL, MCSE, A+, Information Systems Manager Michigan State University - Student Services Educational and Support Services 162 Student Services Building East Lansing, MI 48824 [log in to unmask] <blocked::mailto:[log in to unmask]> (517) 432-7541 Submit technical requests at https://help.ess.msu.edu/ <blocked::http://help.ess.msu.edu/>