Many thanks to all who responded.
There is my original question:
I have problem configuring NTP server on the Solaris 2.51 machine to
work without going to the external servers.
I have installed xntp3-5.93, and my network have multiple subnets.
Most of the replies I received had recommendation how to compile
xntp3-5.93 and install it, because I was not specific in my question,
sorry about that.
The solution that did work came from Steve Williams:
For your ntp.conf try something like
fudge 127.127.1.0 stratum 6
That will set it to use the local clock and set its stratum to 6.
I also found myself great reference for the ntp configuration in Solaris
2.6: there are samples in /etc/inet directory how to setup ntp server
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