Time synchronisation circuit
Time synchronization involves the following subsystems:
- The NTP master time
server: Our master NTP server gathers time from external NTP
servers, and then serves it out to the other internal machines. It
runs on ltnb0
- The Samba server runs on
the same machine as the master NTP server, and sends time to the
Windows clients as soon as the user logs in. This is done in response
to an explicit request by those clients, caused by the following line
NET TIME \\POLLUX
/SET /Y 2>NUL >NUL
and a similar line for NT.
- The other unix machines (NTP slaves) synchronize
themselves from our master server, using the NTP protocol, rather
than contacting the external servers directly.
Needed cisco ports
TCP and UDP ports 123 from & to ltnb0, in order to allow the
master NTP time server to connect to its time sources outside.