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Author Topic: Starting up NTP daemon on Linux to generate packets  (Read 5708 times)

mahtin

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Starting up NTP daemon on Linux to generate packets
« on: April 08, 2008, 01:54:43 PM »

On a Centos 5.0 box I was having an issue with the tunnel timing out and not routing.  Besides needing to fix that, it was easier to create traffic on the tunnel.  I needed to create traffic from the server that went outwards - not just a web site being accessed.

  ntp6.space.net
  ntp.ipv6.linux.ee
  noc.sixxs.net
  nlams01.sixxs.net
  ntp1.bit.nl
  ntp2.bit.nl
  ntp.doubleukay.com
  ntp1.ipv6.teleport-iabg.de
  ntp2.ipv6.teleport-iabg.de


I choose to update my NTP config by adding the following Stratum-2 servers.  I found the list at http://wiki.go6.net/index.php?title=IPv6_NTP_servers . Don't use the Stratum-1 servers for all the normal reasons.

  egrep '^server' /etc/ntp.conf
  server 0.rhel.pool.ntp.org
  server 1.rhel.pool.ntp.org
  server 2.rhel.pool.ntp.org
  server ntp6.space.net
  server ntp.ipv6.linux.ee
  server noc.sixxs.net
  server nlams01.sixxs.net
  server ntp1.bit.nl
  server ntp2.bit.nl
  server ntp.doubleukay.com
  server ntp1.ipv6.teleport-iabg.de
  server ntp2.ipv6.teleport-iabg.de


Note that I left in the standard IPv4 entries from Centos/Redhat.  Restarting NTP via:

   service ntpd reload

Followed by a simple check of the NTP status:

  # ntpq -n -c peers
       remote           refid      st t when poll reach   delay   offset  jitter
  ==============================================================================
  ...
  -2001:608::1000: 32.246.249.54    2 u   38   64  377  236.486   -5.295   3.735
   2001:7d0:0:5:20 .INIT.          16 u    -   64    0    0.000    0.000   0.000
  *2001:838:1:1:21 81.41.136.168    2 u   42   64  377  228.125   -1.242   0.845
  +2001:838:2:1:2a 193.0.0.228      2 u   36   64  377  227.806   -1.244   1.632
  +2001:7b8:3:2c:: 193.0.0.228      2 u   41   64  377  227.755   -1.413   2.430
  -2001:7b8:3:2d:: 193.0.0.228      2 u   37   64  377  226.925    0.206   0.819
   2001:c18:405::1 .INIT.          16 u    -   64    0    0.000    0.000   0.000
  +2001:1b10:100:3 124.226.83.28    2 u   34   64  377  240.815   -1.495   1.501
  -2001:1b10:100:3 73.120.242.92    2 u   35   64  377  240.646   -2.914   3.044
  #


Now I have traffic, a tunnel that stays up and the correct time - v6 time!

Enjoy!
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sffroelich

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Re: Starting up NTP daemon on Linux to generate packets
« Reply #1 on: September 28, 2010, 03:15:09 PM »

i understand this thread posted a while back, but on the off chance the author (or anyone else) is still reading this:

i'm having a problem, pointing my ntp client (Ubuntu) to ipv6 stratum 2 ntp servers, over an HE tunnel.  i can even ping6 the target server, but the ntp daemon never gets out of the INIT state for this target.

it syncs, instead, to a v4 server (much farther away).

i've tried restricting the ntp daemon to a subset of interfaces (using the -I eth0 invocation), and verified that the tunnel (virtual) interface is excluded, but still, no joy.

any ideas?

sff
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