NTP with DCHP

[alfonso82]

Hi, this is my first post on the forum, I have searched the forum for an answer with no luck, I´m trying to get my Pi to update the date and time using NTP and I have tried every solution on the forum and I came to a conclution that the DHCP configuration of my wireless router is screwing up my Pi and not letting it get connected to the NTP servers, I´m a noob when it comes to linux so a step by step answer will be appreciated and thank you in advance.

[efflandt]

Judging from the system logs and /etc/services, ntp uses UDP port 123 to poll ntp servers and that should happen soon after you get IP and everything from a dhcp server (your router).

Does following command show an IP address for eth0 (or wlan0 if wireless): ifconfig

Does following show a default gateway (UG) to your router IP: route -n

Does following show at least one nameserver (often router IP): cat /etc/resolv.conf

Does /var/log/syslog show eth0 errors or any USB devices dropping out (a sign of not enough voltage or something on USB using too much power or not supported).

[alfonso82]

First of all thank you efflandt for a quick reply, I have my Pi connected using wireless module and in the ifconf I only have the SSID and password of my wireless lan, I maneged to fix the IP address of my Pi thru my wireless router, because I´m using it as a headless box .

The route -n command it shows the IP address of my router as the gateway wich I guess is the way it should be.

On cat /etc/resolv.conf I have as a servername the IP address of my router

And finally in the /var/log/syslog I have a LOT of entries and I could´nt find any related to my internet connection or NTP

Thank you one more time for your help

[morgad]

my ntp servers and clients run under dhcp with no problem

could you post your /etc/ntp.conf file? and the result of 'grep ntpd /var/log/daemon.log' ?

best regards
Dave

[alfonso82]

Hi morgad, this is my /etc/ntp.conf file:

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# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#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

# You do need to talk to an NTP server or two (or three).
server ntp.timeserver.com

# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>
#server 0.debian.pool.ntp.org iburst
#server 1.debian.pool.ntp.org iburst
#server 2.debian.pool.ntp.org iburst
#server 3.debian.pool.ntp.org iburst
server 0.south-america.pool.ntp.org
server 1.south-america.pool.ntp.org
server 2.south-america.pool.ntp.org
server 3.south-america.pool.ntp.org
server 4.br.pool.ntp.org

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.
# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient

And this is my /var/log/daemon.log file is too large to post it.

May be if you give me some instruction on what you did to get your Pi working on DHCP I could get mine too and thank you.

[morgad]

Hi
I did nothing to get ntp working with dhcp, it just works.
(I am running Rasbian here)

I tried your ntp.conf file, and it worked (although there are some minor problems)

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$ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 176.74.176.167  .INIT.          16 u    - 1024    0    0.000    0.000   0.000
-200.69.222.89   170.210.222.2    4 u  113  128  377  238.287    1.285   0.467
*200.186.125.195 .ONBR.           1 u   35  128  377  206.004    0.710   0.425
+200.37.61.61    149.20.64.28     2 u  107  128  377  181.360   -1.930   0.662
+200.192.232.8   200.160.7.186    2 u  103  128  377  245.560    4.458   0.513

(ntp.timeserver.com is not an ntp server, server 4.br.pool.ntp.org does not resolve (only 0-3 prefixes are valid))

if ntpq -pn gives 'ntpq: read: Connection refused' then ntp is not running, try
'tail -f /var/log/daemon.log' in one terminal window and then 'sudo service ntp restart' in the other
and see if you get any error messages in the log, my running systems gives

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Dec 14 18:08:53 raspberrypi2 ntpd[4912]: ntpd 4.2.6p5@1.2349-o Fri May 18 20:30:57 UTC 2012 (1)
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: proto: precision = 1.000 usec
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: Listen normally on 1 lo 127.0.0.1 UDP 123
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: Listen normally on 2 eth0 192.168.1.27 UDP 123
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: peers refreshed
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: Listening on routing socket on fd #19 for interface updates
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: restrict: error in address '::' on line 39. Ignoring...
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: restrict: error in address '::1' on line 43. Ignoring...
Dec 14 18:08:53 raspberrypi2 ntpd[4913]: Deferring DNS for 4.br.pool.ntp.org 1
Dec 14 18:08:53 raspberrypi2 ntpd[4933]: signal_no_reset: signal 17 had flags 4000000
Dec 14 18:08:55 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org
Dec 14 18:09:57 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org
Dec 14 18:11:59 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org
Dec 14 18:16:01 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org
Dec 14 18:24:04 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org
Dec 14 18:40:07 raspberrypi2 ntpd_intres[4933]: host name not found: 4.br.pool.ntp.org

on your ntp.conf file

hope this helps narrow down the problem

best regards
Dave

[pluggy]

Anybody established if the OP's internet works yet ?

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ping 8.8.8.8
ping www.google.com

Would be a reasonable starting place. The internet settings being right aren't the same as the internet actually working.

The standard ntp settings work fine, if there is an internet connection

[alfonso82]

Hi morgad, I fixed what you found on my /etc/ntp.conf file and then I did a reboot and I still get no awnser from any ntp server, and when I run ntpq -pn I get this:

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     remote           refid      st t when poll reach   delay   offset  jitter
======================================================
 200.160.0.8     .INIT.          16 u    -   64    0    0.000    0.000   0.000
 200.186.125.195 .INIT.          16 u    -   64    0    0.000    0.000   0.000
 200.192.112.8   .INIT.          16 u    -   64    0    0.000    0.000   0.000
 200.1.22.6      .INIT.          16 u    -   64    0    0.000    0.000   0.000

When I try the "tail -f /var/log/daemon.log" I get:

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Oct 29 20:50:38 raspberrypi ntpd[2189]: ntpd exiting on signal 15
Oct 29 20:50:40 raspberrypi ntpd[2640]: ntpd 4.2.6p5@1.2349-o Fri May 18 20:30:5                                                                                        7 UTC 2012 (1)
Oct 29 20:50:40 raspberrypi ntpd[2641]: proto: precision = 1.000 usec
Oct 29 20:50:40 raspberrypi ntpd[2641]: Listen and drop on 0 v4wildcard 0.0.0.0                                                                                         UDP 123
Oct 29 20:50:40 raspberrypi ntpd[2641]: Listen normally on 1 lo 127.0.0.1 UDP 12                                                                                        3
Oct 29 20:50:40 raspberrypi ntpd[2641]: Listen normally on 2 wlan0 192.168.0.122                                                                                         UDP 123
Oct 29 20:50:40 raspberrypi ntpd[2641]: peers refreshed
Oct 29 20:50:40 raspberrypi ntpd[2641]: Listening on routing socket on fd #19 fo                                                                                        r interface updates
Oct 29 20:50:40 raspberrypi ntpd[2641]: restrict: error in address '::' on line                                                                                         41. Ignoring...
Oct 29 20:50:40 raspberrypi ntpd[2641]: restrict: error in address '::1' on line                                                                                         45. Ignoring...
Oct 29 20:59:13 raspberrypi ntpd[2641]: ntpd exiting on signal 15
Oct 29 20:59:15 raspberrypi ntpd[2723]: ntpd 4.2.6p5@1.2349-o Fri May 18 20:30:57 UTC 2012 (1)
Oct 29 20:59:15 raspberrypi ntpd[2724]: proto: precision = 1.000 usec
Oct 29 20:59:15 raspberrypi ntpd[2724]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Oct 29 20:59:15 raspberrypi ntpd[2724]: Listen normally on 1 lo 127.0.0.1 UDP 123
Oct 29 20:59:15 raspberrypi ntpd[2724]: Listen normally on 2 wlan0 192.168.0.122 UDP 123
Oct 29 20:59:15 raspberrypi ntpd[2724]: peers refreshed
Oct 29 20:59:15 raspberrypi ntpd[2724]: Listening on routing socket on fd #19 for interface updates
Oct 29 20:59:15 raspberrypi ntpd[2724]: restrict: error in address '::' on line 41. Ignoring...
Oct 29 20:59:15 raspberrypi ntpd[2724]: restrict: error in address '::1' on line 45. Ignoring...
Oct 29 20:59:53 raspberrypi wpa_supplicant[1504]: wlan0: WPA: Group rekeying completed with 14:d6:4d:38:3a:54 [GTK=TKIP]

The last thing that I´m guessing is that my router is blocking the ntp servers.

And yes pluggy that was the fisrt thing that I did, if I could ping any site.

[adam van gaalen]

Make sure you have a line like (10.0.0.138 is my DHCP-server):
server 10.0.0.138 iburst
in your file:
/var/lib/ntp/ntp.conf.dhcp

I even added some more lines:
server 0.debian.pool.ntp.org iburst
server 1.debian.pool.ntp.org iburst
server 2.debian.pool.ntp.org iburst
server 3.debian.pool.ntp.org iburst

And all work well now!