[ntp:questions] ARRGH!!! I woke up to a 50 SECOND clock error.

Rob nomail at example.com
Sun Mar 18 10:20:19 UTC 2012


Uwe Klein <uwe at klein-habertwedt.de> wrote:
> Regular DSL here has quite large and spread line delays
> though speed is much higher delay is similar or slightly larger than
> forex ISDN.
> PING 87.186.242.38 (87.186.242.38) 56(84) bytes of data. ( my first pingable outside node )
> 64 bytes from 87.186.242.38: icmp_seq=1 ttl=254 time=48.3 ms
> 64 bytes from 87.186.242.38: icmp_seq=2 ttl=254 time=34.3 ms
> 64 bytes from 87.186.242.38: icmp_seq=3 ttl=254 time=77.4 ms
> 64 bytes from 87.186.242.38: icmp_seq=4 ttl=254 time=70.8 ms
> 64 bytes from 87.186.242.38: icmp_seq=5 ttl=254 time=108 ms
> 64 bytes from 87.186.242.38: icmp_seq=6 ttl=254 time=89.0 ms
> 64 bytes from 87.186.242.38: icmp_seq=7 ttl=254 time=109 ms
> 64 bytes from 87.186.242.38: icmp_seq=8 ttl=254 time=64.1 ms
> 64 bytes from 87.186.242.38: icmp_seq=9 ttl=254 time=76.1 ms
> 64 bytes from 87.186.242.38: icmp_seq=10 ttl=254 time=145 ms
> 64 bytes from 87.186.242.38: icmp_seq=11 ttl=254 time=199 ms
> 64 bytes from 87.186.242.38: icmp_seq=12 ttl=254 time=104 ms
> 64 bytes from 87.186.242.38: icmp_seq=13 ttl=254 time=247 ms
> 64 bytes from 87.186.242.38: icmp_seq=14 ttl=254 time=104 ms

Funny network...

I can ping the same address over my own DSL and get lower and more
stable ping than you do:

ping 87.186.242.38
PING 87.186.242.38 (87.186.242.38) 56(84) bytes of data.
64 bytes from 87.186.242.38: icmp_seq=1 ttl=245 time=34.7 ms
64 bytes from 87.186.242.38: icmp_seq=2 ttl=245 time=36.3 ms
64 bytes from 87.186.242.38: icmp_seq=3 ttl=245 time=35.3 ms
64 bytes from 87.186.242.38: icmp_seq=4 ttl=245 time=33.6 ms
64 bytes from 87.186.242.38: icmp_seq=5 ttl=245 time=34.8 ms
64 bytes from 87.186.242.38: icmp_seq=6 ttl=245 time=35.8 ms
64 bytes from 87.186.242.38: icmp_seq=7 ttl=245 time=34.2 ms
64 bytes from 87.186.242.38: icmp_seq=8 ttl=245 time=35.3 ms
64 bytes from 87.186.242.38: icmp_seq=9 ttl=245 time=33.0 ms
64 bytes from 87.186.242.38: icmp_seq=10 ttl=245 time=34.2 ms
^C
--- 87.186.242.38 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9043ms
rtt min/avg/max/mdev = 33.069/34.776/36.339/0.943 ms

Pinging something local in my provider yields stable pingtimes within
13-14 ms...

Maybe your provider still uses old ATM technology between the subscribers
and the DSL router, and the network is heavily overbooked.

This is, however, not a generic property of DSL.   DSL can have stable
roundtrip times.



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