Where can I find a Network Time Protocol (NTP) server?
A. There are several possibilities. First, many companies have internal NTP servers. Check with the network administrator. UNIX workstations and routers are often synchronized in this manner. Second, if Internet connectivity is available, you can use a server on the Internet. Many Internet service providers (ISPs) have NTP servers. There is a list of publicly accessible servers on the US Naval Observatory web page . To get through a firewall, make sure UDP port 123 is open in both directions. It is also possible to set up an NTP server on a UNIX or Microsoft Windows NT system. Bear in mind that this is a waste of time if your server does not have a good reference clock. The software is available at the NTP home page , but you must build it yourself if you get it from there. Note that Cisco Systems, Inc. cannot be responsible for the NTP servers of customers.
