[ntp:questions] NTP servers not accessible on some networks

Antonio Marcheselli puppa at me.la
Wed May 21 17:13:09 UTC 2014


>
> You can try "traceroute -U -p 123 ip.ad.dr.es" to see where it is being
> blocked, and if it is nearby to your ISP complain to your ISP about it.
>

Hi,

Here is a standard traceroute

xxxxxxx-2:~# traceroute 130.88.200.4
traceroute to 130.88.200.4 (130.88.200.4), 30 hops max, 40 byte packets
  1  192.168.241.1 (192.168.241.1)  0.000 ms  0.000 ms  0.000 ms
  2  * * *
  3  109.204.0.218 (109.204.0.218)  43.988 ms  45.987 ms  47.987 ms
  4  * * *
  5  * * *
  6  * * *
  7  135.196.65.115 (135.196.65.115)  31.991 ms  33.991 ms  35.990 ms
  8  195.66.224.15 (195.66.224.15)  37.990 ms  38.989 ms  40.989 ms
  9  146.97.35.181 (146.97.35.181)  42.988 ms  44.988 ms  46.987 ms
10  146.97.33.14 (146.97.33.14)  53.985 ms  54.985 ms  56.984 ms
11  146.97.33.42 (146.97.33.42)  60.983 ms  62.983 ms  36.990 ms
12  146.97.41.62 (146.97.41.62)  39.989 ms  41.988 ms  41.989 ms
13  194.66.27.18 (194.66.27.18)  41.988 ms  42.988 ms  42.988 ms
14  194.66.26.102 (194.66.26.102)  43.988 ms  43.988 ms  43.988 ms
15  130.88.250.73 (130.88.250.73)  381.895 ms  380.895 ms  378.896 ms
16  130.88.200.4 (130.88.200.4)  37.990 ms  37.989 ms  37.990 ms

Here is for port 123 as you suggested

xxxxx-2:~# traceroute -U -p 123 130.88.200.4
traceroute to 130.88.200.4 (130.88.200.4), 30 hops max, 40 byte packets
  1  192.168.241.1 (192.168.241.1)  1.000 ms  1.000 ms  1.000 ms
  2  * * *
  3  109.204.0.218 (109.204.0.218)  34.990 ms  37.989 ms  38.989 ms
  4  * * *
  5  * * *
  6  * * *
  7  135.196.65.115 (135.196.65.115)  55.985 ms  55.985 ms  57.984 ms
  8  * * *
  9  * * * (then just nothing)

What do I get from this? It's definitely not my router (192.168.241.1).

Thank you!



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