synchronize NTP of a computer XP with a Router 2500

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Jun 1st, 2007
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What I must make to synchronize NTP of a computer XP with a Router 2500. Annexed, commando that I execute from XP and error, "sh ver" of router, and configuration NTP in router




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C:\>net time \\192.168.50.1

System error 53 has occurred.


The network path was not found.


Sistema Operativo


Windows xp


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Cisco Internetwork Operating System Software

IOS (tm) 2500 Software (C2500-DS-L), Version 11.2(3)P, SHARED PLATFORM, RELEASE

SOFTWARE (fc1)

Copyright (c) 1986-1996 by cisco Systems, Inc.

Compiled Tue 31-Dec-96 17:25 by tamb

Image text-base: 0x030358E4, data-base: 0x00001000


ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE

ROM: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASE SOFTWARE (f

c1)


pzr-josejps01 uptime is 20 weeks, 6 days, 23 hours, 6 minutes

System restarted by power-on at 09:56:24 GMT-4 Fri Jan 5 2007

System image file is "flash:80135103.bin", booted via flash


cisco 2500 (68030) processor (revision N) with 2048K/2048K bytes of memory.

Processor board ID 05646962, with hardware revision 00000000

Bridging software.

X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read ONLY)


Configuration register is 0x2102


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xxxxxxxxx#sh ntp status

Clock is synchronized, stratum 6, reference is 172.23.8.1

nominal freq is 250.0000 Hz, actual freq is 250.0019 Hz, precision is 2**19

reference time is CA0A974F.4E2BC650 (09:02:07.305 GMT-4 Fri Jun 1 2007)

clock offset is -0.3640 msec, root delay is 86.61 msec

root dispersion is 57.56 msec, peer dispersion is 0.67 msec


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ntp authentication-key 2807200 md5 xxxxxxxxxxxx 7

ntp authenticate

ntp trusted-key 2807200

ntp clock-period 17179732

ntp source Loopback0

ntp peer 172.23.8.1



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Overall Rating: 5 (3 ratings)
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paolo bevilacqua Fri, 06/01/2007 - 05:29
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Hello,


the router does not support time service via MS protocols. It support standard NTP and XP can use it synchronize time from the date/time control panel and entering the address in the time server field.


Hope this helps, please rate post if it does!

anandramapathy Fri, 06/01/2007 - 05:34
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Yes. basically when you type \\ip address, you are establishing an rpc / netbios session to the Router which will server NTP requests over port 123 UDP.


This will not be possible.

peguayapero Fri, 06/01/2007 - 06:24
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Thanks, When I place the IP 192.168.50.1 in the server field, say to me that it cannot synchronize



paolo bevilacqua Fri, 06/01/2007 - 06:35
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Hi,


I've seen this happening with some IOS version. I'm afraid you would have to rune some debugs / packet capture to understand why is not working.

peguayapero Fri, 06/01/2007 - 08:10
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Another Question


The configuration of router 192.168.50.1 is correct?,In order to allow that the Computer xp synchronizes with router?.



ntp authentication-key 2807200 md5 xxxxxxxxxxxx 7

ntp authenticate

ntp trusted-key 2807200

ntp clock-period 17179732

ntp source Loopback0

ntp peer 172.23.8.1



paolo bevilacqua Fri, 06/01/2007 - 08:20
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Hello,


I think that if you configure authentication, the PC will not be able to obtain time from the router.

Thank you for the nice rating and good luck!



peguayapero Sat, 06/02/2007 - 16:58
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That it would have to do, so that router 192.168.50.1 it continued synchronizing NTP via authentication with 172.23.8.1, but allows to the computer xp to synchronize NTP with 192.168.50.1 without authentication?


I think that it could have the following configuration in 192.168.50.1:



ntp authentication-key 2807200 md5 xxxxxxxxxxxx 7

ntp trusted-key 2807200

ntp clock-period 17179732

ntp source Loopback0

ntp server 172.23.8.1 key 2807200


Single it clears the commando: "ntp authenticate"



paolo bevilacqua Sat, 06/02/2007 - 17:01
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Hi,

Honestly I'm not sure if you can have the router to use authentication to an NTP server but not require authentication with the PCs.

Hope it may work for you.

peguayapero Mon, 06/04/2007 - 15:10
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Hi


PC XP could be authenticated, with the configuration that mentions previously, the PC that we were using of test, had a problem, at configuration level. This document I help myself to understand more on "NTP Authentication"


http://www.internetworkexpert.com/resources/01700369.htm



I Use the commando "debug NTP packet", to analyze what it happened in router at NTP level


peguayapero Mon, 06/04/2007 - 15:12
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The configuration in the router is:


ntp authentication-key 2807200 md5 xxxxxxxxxxxx 7

ntp authenticate

ntp trusted-key 2807200

ntp clock-period 17179732

ntp source Loopback0

ntp peer 172.23.8.1


Richard Burts Mon, 06/04/2007 - 17:55
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paolo


I have configured routers to authenticate NTP with the server and to offer NTP to clients without authentication and it worked.


HTH


Rick

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