[ntp:questions] abuse or bug ?
Henk P. Penning
henkp at cs.uu.nl
Thu Jan 27 08:25:34 UTC 2005
Hi,
it has been noted that some clients poll time servers at
a rate of 1 packet per second, for an unlimited period.
Is this a bug in the standard ntpd software or
abuse by bad software or badly configured clients ?
The example below make me think it is a bug.
client : 129.105.100.183 (in cs.northwestern.edu)
hardware : Sun, SunBlade 150
operating system :
Linux gandalf 2.4.26-sparc-r2 #14 Wed Sep 22 15:27:12 CDT 2004 sparc64
sun4u TI UltraSparc IIe (Hummingbird) GNU/Linux
ntp : ntp 4.2.0-r2
config :
server pool.ntp.org
driftfile /var/lib/ntp/ntp.drift
restrict default notrust nomodify
restrict 127.0.0.1
It has sent 438851 packets in the last 129.3 hours to 'ntp.cs.uu.nl'.
The client says the server is unreachable.
There may well be a problem with the client's ntpd config
or the clients network setup ; the interesting thing is that
standard ntpd software with a 'normal config', running on
of-the-shelf hardware, can show the undesired behaviour.
The contact for the client is Stefan Birrer (thanks for all
the info) [s-birrer (at) northwestern edu].
Henk Penning
---------------------------------------------------------------- _
Henk P. Penning, Computer Systems Group R Uithof CGN-A232 _/ \_
Dept of Computer Science, Utrecht University T +31 30 253 4106 / \_/ \
Padualaan 14, 3584CH Utrecht, the Netherlands F +31 30 251 3791 \_/ \_/
http://www.cs.uu.nl/staff/henkp.html M penning at cs.uu.nl \_/
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