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112 S100 User Guide – Rev. D – June 2005
SyncServer S100
How many NTP requests can be processed by the S100 each second?
More than 5,000 requests per second can be processed.
Does the S100 support NTP v4?
The S100 does incorporate the added functions of NTP v4. Specifically, the S100 supports
the autokey scheme to secure the delivery of the NTP packets to NTP v4 clients as well as
authentication of the server to the client.
Can the S100 utilize a certificate from an external CA?
The S100 can acquire a digital certificate from a public or private CA. The ability to generate
a PKCS 10
certificate request is supported from the S100 secure web interface.
How is the interface to the S100 secured?
The S100 supports a https (SSL) interface for remote client management.
What security functions are provided with the S100?
• NTP v3: crypto check sum
• NTP v4: Autokey
• Https: SSL v3 (web based user interface)
• SSH: SSL v3 remote login (secure terminal interface)
Does the S100 support any functions to restrict user access to NTP service? Can the S100 set up
clients' IP address to be connected?
The S100 can be configured with a IP address-based restrict list to selectively deny NTP
service to a subnet or a single network client. Refer to the “restrict” command in the NTP
documentation.
What is the bandwidth utilization (TCP/IP) each time an NTP client gets a time update from the NTP
server?
Standard NTP request is a 48-byte UDP packet and the reply is the same. NTP v3
authentication adds 12 or 16 bytes to that, on request and reply. NTP v4 adds about the same
with a few extra overhead packets.