NTP compatibility with Windows 2000

[CHM1]

I can't update clock on cisco switches when the ntp server is a Windows2000 one.
Anybody heard about this problem ?
NTP frames seem to be good ans the cisco switch obtains the response but it does not update clock.
Here's the debugging (deb ntp packets + deb ntp val) :

04:50:29: NTP: xmit packet to 192.9.0.1:
04:50:29: leap 0, mode 3, version 3, stratum 3, ppoll 64
04:50:29: rtdel 09BE (38.055), rtdsp 1E39D (1889.114), refid 863B0105 (134.59.1
.5)
04:50:29: ref C4D84A53.23068C72 (12:38:59.136 CET Thu Aug 26 2004)
04:50:29: org C4D84A77.00000000 (12:39:35.000 CET Thu Aug 26 2004)
04:50:29: rec C4D84A3A.1A966773 (12:38:34.103 CET Thu Aug 26 2004)
04:50:29: xmt C4D84A7A.1B9E30FB (12:39:38.107 CET Thu Aug 26 2004)
04:50:29: NTP: rcv packet from 192.9.0.1 to 192.9.150.1 on Vlan1:
04:50:29: leap 0, mode 4, version 3, stratum 2, ppoll 64
04:50:29: rtdel 0000 (0.000), rtdsp 1E39D (1889.114), refid 86D66406 (134.214.1
00.6)
04:50:29: ref 00000000.00000000 (01:00:00.000 CET Mon Jan 1 1900)
04:50:29: org C4D84A7A.1B9E30FB (12:39:38.107 CET Thu Aug 26 2004)
04:50:29: rec C4D84AB7.03D70A3D (12:40:39.014 CET Thu Aug 26 2004)
04:50:29: xmt C4D84AB7.03D70A3D (12:40:39.014 CET Thu Aug 26 2004)
04:50:29: inp C4D84A7A.1BEFF8B7 (12:39:38.109 CET Thu Aug 26 2004)
04:50:29: NTP: packet from 192.9.0.1 failed validity tests 20
04:50:29: Peer/Server Clock unsynchronised

What about the error message from the deb command ? (where to find the explanation for "failed validity tests 20" ?)

 

[IPKONFIG]

You still having this problem?

"I can picture a world without war. A world without hate. A world without fear. And I can picture us attacking that world, because they'd never expect it."
- Jack Handey, Deep Thoughts

 

[krr]

Well, W2K calls it NTP, but it really is SNTP. SNTP is a small subset of NTP and is upward compatible, i.e. an SNTP client can get the time from an NTP server. The other way - NTP client get time from SNTP server - does NOT work.

Unfortunately, W2K only implements an SNTP server and your switches have real NTP clients. This is why it doesn't work.

But you can quite easily disable the W2K Time Service and install a real NTP server+client. I use a Windows port of the official Unix ntpd. You can download it from

http://www.five-ten-sg.com/util/ntp4172.zip

It works very well at no cost. If you want to learn more about NTP visit

http://www.ntp.org/

Cheers *Rob