ntp: Add the SRCF time server

files/ntp/etc/ntp.conf

 # This is the default site ntpd configuration file.  It queries the three
-# stratum-one time servers, which use GPS receivers for accurate time.
+# stratum-one time servers, which use GPS receivers for accurate time.  It also
+# queries SRCC's stratum-one time server, located in SRCF, which also uses GPS.
 
 # Listen to the stratum 2 pool.
 server time-a.stanford.edu iburst
 server time-b.stanford.edu iburst
 server time-c.stanford.edu iburst
+server srcf-ntp.stanford.edu iburst
 
 # Save the clock drift.
 driftfile /var/lib/ntp/ntp.drift
 
 # Only talk to the network where the time servers are.
 restrict 171.64.7.0 mask 255.255.255.0 nomodify
+restrict 171.66.97.64 mask 255.255.255.192 nomodify
 restrict 204.63.224.64 mask 255.255.255.192 nomodify
 
 # Allow all settings from our localhost interface.