RVL200 blocks NTP traffic

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by lucaf, Oct 25, 2007.

  1. lucaf

    lucaf LI Guru Member

    I am running 1.1.7 on my RVL200.
    Since I upgraded from 1.1.1 none of my Windows PC in the LAN are able to update the time using NTP protocol.

    Any suggestion on how to fix this?


  2. Toxic

    Toxic Administrator Staff Member

  3. lucaf

    lucaf LI Guru Member

    I uploaded 1.1.8, rebooted, hanged, used TFTP to get it back to 1.1.7, upgraded to 1.1.8, this time it worked, set factory defaults, re-configured everything....

    Not one single PC I have connected behind the RVL200 is able to synch the time with an NTP server out there.

    ...Other than that everything else looks fine.

    Can anyone test it out and see if you can get Windows to update the time?

    If not do you have any suggestion? opening some port maybe?

  4. Toxic

    Toxic Administrator Staff Member

    what ntp IP or name are you using on your PC's.

    dont know ifthis may work, but have you tried adding a access rule (under firewall link) to allow ANY ntp (you may need to add the service in service management) from LAN source to destination (the ntp server)
  5. ccbadd

    ccbadd Network Guru Member

    I have an RVL200 set up and NTP works fine. I use pool.ntp.org for my server and I am running fw 1.1.8 RC1 with no special firewall rules.
  6. Toxic

    Toxic Administrator Staff Member

    are you using the default windows ntp servers?

    time.windows.com or time.nist.gov are evry unresponsive at times. try:


    and see it it works.
  7. lucaf

    lucaf LI Guru Member

    Now it works.
    The reason why NTP was not working is that I had some big download going on on another server and I believe that would give NTP too much jitter wich makes windows discard the synchronization.

    Thanks anyway for your suggestions.
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