config timeserver
-       option hostname ac-ntp0.net.cmu.edu
-#      option interface        wan
-
-config timeserver
        option hostname ptbtime1.ptb.de
+#      option interface        wan
 
 config timeserver
-       option hostname ac-ntp1.net.cmu.edu
-
-config timeserver
-       option hostname tick.greyware.com
+       option hostname time-a.nist.gov
 
 config timeserver
        option hostname ntp.xs4all.nl
        option hostname ptbtime2.ptb.de
 
 config timeserver
-       option hostname cudns.cit.cornell.edu
+       option hostname time-b.nist.gov
 
 config timeserver
        option hostname ptbtime3.ptb.de