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Superuser
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Message 11 of 14
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Re: NTP issues

"it's working for me so therefore it must be working everywhere"

I'd prefer to say it's more along the lines of "it's working for me so therefore it SHOULD be working everywhere"

Here's my current ntpq -p output.- Note: I rebooted the windows and I got another bunch of uk.ntp.pool servers.  Including the one that's giving you grief.

C:\Users\timdu>ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
-time.shf.uk.as4 192.146.137.13   3 u   12  128  377   24.687   -1.937   1.747
+ntp3.wirehive.n 195.66.241.3     2 u    9  128  377   20.541   -0.515   2.167
*185.121.25.166  85.199.214.99    2 u  117  128  377   20.701    0.674   0.358
-95.211.212.5 (v 131.188.3.220    2 u   59  128  377   23.618    0.205   0.625
+185.159.125.100 193.79.237.14    2 u   31  128  377   24.285    1.462   1.151

I apologise if I'm teaching you to suck eggs BTW - but I do try to think "out loud" as it were.

We can see that in my case the preferred server is the one that's giving you issues and the reachability stat for all the servers is 377 meaning that the last 8 NTP updates worked.  (Before the reboot, the reference server and one other had 377 while the others showed some issues.

So if course the question to ask is.  "Why is it now working for me but not you?"

Virgin Media don't normally block the NTP protocol.  In fact AFAIK the only ports that they actively block are ports such as the dreaded NetBios trio.

Tim

 

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Superuser
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Message 12 of 14
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Re: NTP issues

Just a thought - I'm sure your aware that blocks can actually occur at the time provider end.

After tll the NTP pool project does contain this little nugget

5. Provider reserves the right, at its sole discretion, to take steps to block abusive behavior. End-User, however, acknowledges and agrees that because of limited access control, abusive behavior may cause collateral damage to other end-users.

Note: that even if you haven't been a bad boy yourself, you can still get caught up in blocks that are instigated for other reasons.

Have you tried modem mode to see what happens when your IP address changes?

After all, all the working scenarios you mention will have your connections coming from a different public facing IP, including the VPN connection.

Tim

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ToffeeSurprise
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Message 13 of 14
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Re: NTP issues

I haven't got the hardware to try modem mode at the moment, but that is a useful idea to investigate, thank you.

As mentioned though other NTP providers are not working not just the NTP pool. I would also have thought that if an IP address was blocked then it would block everything from that IP, not just NTP. ICMP clearly works, so a block at the far end seems unlikely.

Since the VM NTP server and the Windows one work, at least I've found a better workaround than using a VPN, so there's that as well.
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chenks
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Message 14 of 14
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Re: NTP issues


@ToffeeSurprise wrote:
I haven't got the hardware to try modem mode at the moment, but that is a useful idea to investigate, thank you.

you do though? if you have a pc or a laptop with an ethernet connection then you have the hardware to use modem mode.

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