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On Wed, 25 Nov 2009, Grant Sewell wrote:
On Thu, 12 Nov 2009 14:55:52 +0000 Grant Sewell wrote:Hi all, We have some energy-monitoring networked devices in the office and we need to know how frequently our devices request NTP (UDP#123) info. Is there anyway to monitor another machine's network traffic from a Linux machine? Cheers. Grant. :)OK, I've decided to put myself in the stream... I want to install an NTP service on the underused virtual Linux server (Debian Stable) and have our "networked device" contact that for NTP info. I have installed ntp and my /etc/ntp.conf file looks like this: --- BEGIN NTP.CONF FILE --- driftfile /var/lib/ntp/ntp.drift statsdir /var/log/ntpstats/ statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable server uk.pool.ntp.org iburst server europe.pool.ntp.org iburst restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery restrict 127.0.0.1 restrict ::1 restrict 192.168.1.0 mask 255.255.255.0 notrust nomodify notrap --- END NTP.CONF FILE ---
Hm. it's a bit verbose, isn't it? All you really need to get going is one line: server uk.pool.ntp.orgAnd you can list that 2 or 3 times as 'uk.pool.ntp.org' is several machines. The rest of the file is config flab.
Once it's going with the basics, then you can add in the other stuff, if you need. Most of it is about premissions and logging, but lets face it, you'll never read the log-files and you're behind a firewall...
However...
When I run "ntpdate -q [ip address of server]" from my Ubuntu laptop it says: "no server suitable for synchronization found". When I run "ntpdate -q localhost" on the server, it shows the service is accepting connections via localhost.
If you can run ntpdate then ntp isn't running, and if ntp isn't running then you won't be providing time services.
# ps ax | fgrep ntp 2852 ? Ss 0:00 /usr/sbin/ntpd -p /var/run/ntpd.pid -g You ought to see something like that from ps ax | fgrep ntp
nmap doesn't show NTP as a running service, when queried either locally or remotely. What am I doing wrong?
Not starting ntp. Try this: (as root) ntpdate -b uk.pool.ntp.org /etc/init.d/ntp start If this whinges, then check syslog for why. then: ntpq -c rlLook for "stratum=XX" in the output - usually at the end of the 3rd line down.
also: ntpq -c peers and it'll tell you what it's synced to. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html