[ntp:questions] pool.ntp.org down?

Guy Macon "http://www.guymacon.com/" at ntp.isc.org
Wed Jun 13 14:07:56 UTC 2007




Bob Geddes wrote:

>For about the last couple of weeks or so I have not been able to get DNS
>responses from pool.ntp.org 
>Anyone know why?

Here are the results of a few tests I did from my oco.net dialup:

pool.ntp.org has a few minor DNS configuration problems, but is resolving.
See http://www.dnsstuff.com/tools/dnsreport.ch?%26domain%3Dpool.ntp.org

I am able to synchronize reliably:

ntpdate path = /bin/ntpdate
work file = /tmp/freetime.dat pool.ntp.org, -0000 
server 193.125.143.140, stratum 2, offset -0.023540, 
delay 0.36536 offset = -0.02354 time zone = -0 
Time correction = -0.02354 (0 sec. -23539 usec) 
Succesfully adjusted clock


ntpdate path = /bin/ntpdate
work file = /tmp/freetime.dat pool.ntp.org, -0000 
server 193.125.143.140, stratum 2, offset -0.006980, 
delay 0.36537 offset = -0.00698 time zone = -0 
Time correction = -0.00698 (0 sec. -6980 usec) 
Succesfully adjusted clock


ntpdate path = /bin/ntpdate
work file = /tmp/freetime.dat pool.ntp.org, -0000 
server 193.125.143.140, stratum 2, offset -0.005079, 
delay 0.36522 offset = -0.005079 time zone = -0 
Time correction = -0.005079 (0 sec. -5078 usec) 
Succesfully adjusted clock




I was seeing 50% losses when I pinged pool.ntp.org,
but 5 minutes later I saw 0% losses:


ping -n 100 -w 1000 pool.ntp.org
Pinging pool.ntp.org [65.254.53.19] with 32 bytes of data:
Reply from 65.254.53.19: bytes=32 time=177ms TTL=51
Reply from 65.254.53.19: bytes=32 time=199ms TTL=51
Request timed out.
Request timed out.
Reply from 65.254.53.19: bytes=32 time=200ms TTL=51
...
Request timed out.
Reply from 65.254.53.19: bytes=32 time=183ms TTL=51
Request timed out.
Request timed out.
Reply from 65.254.53.19: bytes=32 time=182ms TTL=51

Ping statistics for 65.254.53.19:
    Packets: Sent = 100, Received = 45, Lost = 55 (55% loss),
Approximate round trip times in milli-seconds:
    Minimum = 172ms, Maximum =  277ms, Average =  92ms



ping -n 100 -w 1000 pool.ntp.org
Pinging pool.ntp.org [65.254.53.19] with 32 bytes of data:
Reply from 65.254.53.19: bytes=32 time=202ms TTL=51
Reply from 65.254.53.19: bytes=32 time=178ms TTL=51
Request timed out.
Reply from 65.254.53.19: bytes=32 time=201ms TTL=51
Request timed out.
...
Reply from 65.254.53.19: bytes=32 time=198ms TTL=51
Request timed out.
Reply from 65.254.53.19: bytes=32 time=211ms TTL=51
Reply from 65.254.53.19: bytes=32 time=213ms TTL=51
Request timed out.

Ping statistics for 65.254.53.19:
    Packets: Sent = 100, Received = 51, Lost = 49 (49% loss),
Approximate round trip times in milli-seconds:
    Minimum = 173ms, Maximum =  260ms, Average =  104ms




ping -n 100 -w 1000 pool.ntp.org
Pinging pool.ntp.org [65.254.53.19] with 32 bytes of data:
Reply from 65.254.53.19: bytes=32 time=210ms TTL=51
Request timed out.
Reply from 65.254.53.19: bytes=32 time=180ms TTL=51
Request timed out.
Request timed out.
...
Request timed out.
Request timed out.
Reply from 65.254.53.19: bytes=32 time=191ms TTL=51
Reply from 65.254.53.19: bytes=32 time=192ms TTL=51
Reply from 65.254.53.19: bytes=32 time=221ms TTL=51

Ping statistics for 65.254.53.19:
    Packets: Sent = 100, Received = 51, Lost = 49 (49% loss),
Approximate round trip times in milli-seconds:
    Minimum = 175ms, Maximum =  1473ms, Average =  140ms


ping -n 100 -w 1000 pool.ntp.org

Pinging pool.ntp.org [65.254.53.19] with 32 bytes of data:

Reply from 65.254.53.19: bytes=32 time=210ms TTL=51
Reply from 65.254.53.19: bytes=32 time=184ms TTL=51
Reply from 65.254.53.19: bytes=32 time=184ms TTL=51
Reply from 65.254.53.19: bytes=32 time=223ms TTL=51
Reply from 65.254.53.19: bytes=32 time=193ms TTL=51
...
Reply from 65.254.53.19: bytes=32 time=210ms TTL=51
Reply from 65.254.53.19: bytes=32 time=180ms TTL=51
Reply from 65.254.53.19: bytes=32 time=210ms TTL=51
Reply from 65.254.53.19: bytes=32 time=210ms TTL=51
Reply from 65.254.53.19: bytes=32 time=189ms TTL=51

Ping statistics for 65.254.53.19:
    Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 178ms, Maximum =  602ms, Average =  226ms


-- 
Guy Macon
<http://www.guymacon.com/>




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