[ntp:questions] Questions about joining pool.ntp.org

NPG nathan at cmpublishers.com
Mon Aug 29 19:31:26 UTC 2011


On 8/27/2011 2:27 AM, Chuck Swiger wrote:
> Hi--
> 
> On Aug 26, 2011, at 8:34 PM, NPG wrote:
>> What we plan to do.
>> Add 1 more stratum 2 server and 2 stratum 1 servers to the internal
>> server's sync list.
>> When we are sure that things are working right, make our internal NTP
>> server accessible to the internet, and join it to pool.ntp.org.
>>
>> Do I have the right idea?
> 
> Sounds good.  Try to make sure you've got a recent build of NTP,
> and consider posting the 'ntpq -pcrv' scoreboard for a review before
> joining the pool in case someone catches something.
> 

OK, here that is
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
-sundial.columbi 128.59.39.48     2 u  108  256  177   36.697   -6.936
 2.302
+dns3.cit.cornel 192.5.41.209     2 u  113  256  377    8.864   -0.958
 1.218
-tick.jrc.us     208.90.144.72    2 u  115  256  377   31.767   -1.480
 3.466
*nist1-ny.ustimi .ACTS.           1 u   35  256  377   25.279    4.049
 5.083
+clock.nyc.he.ne .CDMA.           1 u  116  256  377   22.828   -2.531
 1.894
associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
version="ntpd 4.2.6p2 at 1.2194-o Sun Oct 17 13:45:13 UTC 2010 (1)",
processor="i686", system="Linux/2.6.32-5-686", leap=00, stratum=2,
precision=-20, rootdelay=25.279, rootdisp=16.717, refid=64.90.182.55,
reftime=d2065e6f.61bc9123  Mon, Aug 29 2011 18:52:31.381,
clock=d2065f92.1cd347b2  Mon, Aug 29 2011 18:57:22.112, peer=11225, tc=8,
mintc=3, offset=0.409, frequency=50.513, sys_jitter=5.675,
clk_jitter=1.834, clk_wander=0.571

>> Am I missing anything?
> 
> When you speak of "internal", that generally implies a host behind
> a firewall or router performing NAT.  

Correct.

> An NTP server handles huge numbers
> of very small packets; poorly configured firewalls which attempt to
> preserve state for UDP connections may experience significant problems
> (not just extra latency).
> 
We use IPTables on Linux.  Is there anything I need to worry about there?

-- 
Sincerely,

Nathan Gibbs

Systems Administrator
Christ Media
http://www.cmpublishers.com




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