[ntp:questions] Re: UK pool server denying access

Ronan Flood ronan at noc.ulcc.ac.uk
Tue Oct 4 14:53:19 UTC 2005


"David J Taylor" <david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk.invalid> wrote:

> Thanks, Ronan.  I can ask it a question with ntpq, but my PC which was 
> rebooted at 07:00 UTC this morning shows:
> 
> +81-5-136-18.dsl 152.78.128.60    3 u  473  512  377   34.335   -6.285 
> 0.308
> -spork.qfe3.net  131.188.3.222    2 u  223  512  377   23.466   -1.000 
> 1.398
>  gw.roaima.co.uk .DENY.          16 u   6h 1024    0    0.000    0.000 
> 4000.00
> 
> (sorry for any wrap).
> 
> So whilst the PC can see other external servers correctly, there is some 
> problem communicating NTP with gw.roaima.co.uk.

It's fed you a kod packet by the look of it:

ntpdc -n -c reslist 212.159.114.45
   address          mask            count        flags
=====================================================================
0.0.0.0         0.0.0.0          20028690  nomodify, nopeer, notrap, limited, kod

I'm not familiar with the limiting feature, but if I read the code aright
and if your NNTP-posting-host header is to be believed, you're in 82.x.x.x
and this server (ntpd 4.1.2) will only allow 3 active IPs in that "class A"
per hour.  That might not be a sensible config for a public server ...

-- 
                      Ronan Flood <R.Flood at noc.ulcc.ac.uk>
                        working for but not speaking for
             Network Services, University of London Computer Centre
     (which means: don't bother ULCC if I've said something you don't like)




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