I have xntpd configured to use half a dozen time servers.  If I restart
xntpd while connected to the Internet, it will synchronize the clock
within a few minutes as expected.  When I disconnect, the system log
shows messages:
     xntpd[ddd]: sendto(xx.xx.xx.xx): No route to host
When my system later calls back into the Internet, the log shows:
     xntpd[ddd]: Connection re-established to xx.xx.xx.xx
but even after waiting more than half an hour, xntpd still doesn't
synchronize to the time servers!  xntpdc -p shows:

     remote           local      st poll reach  delay   offset    disp
=======================================================================
=ntp.tmc.edu     5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=nyse.cox.smu.ed 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=nebu1-atm.ucsd. 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=alpha.tricity.w 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=tock.CS.UNLV.ED 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=ODP-SUN3.TAMU.E 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=castor.nevada.e 5.0.0.0         16   64    0 0.00000  0.000000 16.0000
=libra.rice.edu  5.0.0.0         16   64    0 0.00000  0.000000 16.0000

but xntpdc's iostats command shows that packets are being sent and
received.  Why can't it synchronize the clock again?  And, BTW, what
does the local address 5.0.0.0 mean?

-- Trevin Beattie