[ntp:questions] help needed for ntpd ipv6 setup

Marc-Andre Alpers m-a.alpers at web.de
Mon Nov 29 20:37:49 UTC 2010


Hello!

Have nobody a solution or idea wat is wrong with my server?

This works:

r34210:/home/marc-andre# ntpq -p -4 127.0.0.1
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*ntp0.ovh.net    .GPS.            1 u   60   64    7    0.508    0.929   0.134
 chime1.surfnet. .GPS.            1 u   58   64    7   10.539    3.037   0.026
 chime2.surfnet. .GPS.            1 u   58   64    7   17.382    4.859   0.107
 ntp0.nl.uu.net  .PPS.            1 u   54   64    7   13.025   -0.139   0.181
 ntp1.nl.uu.net  .PPS.            1 u   55   64    7   12.048   -0.045   0.120
 adsl.remco.org  .GPS.            1 u   54   64    7   22.736    4.901   0.224
 2001:41d0:2:1a8 .INIT.          16 -    -   64    0    0.000    0.000   0.000
r34210:/home/marc-andre#

This not:

r34210:/home/marc-andre# ntpq -p -6 ::1
::1: timed out, nothing received
***Request timed out

But on my home linux box it works:

marc-andre at lanserver:~$ ntpq -p -6 ::1
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*GENERIC(0)      .DCFa.           0 l   60   64  377    0.000   -0.334   1.130
-fritz.box       52.76.120.147    2 u   49   64  377    0.829    4.623   1.234
-r34210.ovh.net  213.251.128.249  2 u   41   64  377   24.438    0.256   0.838
-elara.fnutt.net 192.36.143.151   2 u   37   64  377   22.845   -0.562   2.080
-dexter.wzw.tum. 134.34.3.18      2 u   13   64  377   28.448    0.397   0.844
+ptbtime1.ptb.de .PTB.            1 u   29   64  377   13.888    1.475   0.599
-2003:0:4:ff::ff .GPS.            1 u   57   64  377   54.314   -6.705   1.261
-2003:0:8:ff::ff .GPS.            1 u   39   64  377   51.726   -6.537   0.663

marc-andre at lanserver:~$


Netstat on my dedicated server shows:

r34210:/home/marc-andre# netstat -6lu
Aktive Internetverbindungen (Nur Server)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
udp6       0      0 ip6-localhost:domain    [::]:*
udp6       0      0 [::]:ntp                [::]:*
r34210:/home/marc-andre#


But my home linux shows this. On all ipv6 adresses is listening.

marc-andre at lanserver:~$ netstat -6lu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
udp6       0      0 fe80::209:5bff:fe60:ntp [::]:*
udp6       0      0 2a01:198:31d:1:209::ntp [::]:*
udp6       0      0 localhost:ntp           [::]:*
udp6       0      0 [::]:ntp                [::]:*
udp6       0      0 [::]:domain             [::]:*
udp6       0      0 [::]:64738              [::]:*
marc-andre at lanserver:~$


In tcpdump i can see that packet arrived my dedicated server. But he does
not answer.

r34210:/home/marc-andre# tcpdump ip6 and udp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
21:15:47.803245 IP6 2a01:198:31d:1:7488:d3c2:6218:abb9.ntp > 2001:41d0:2:1a88::1.ntp: NTPv4, Client, length 48
21:15:49.802749 IP6 2a01:198:31d:1:7488:d3c2:6218:abb9.ntp > 2001:41d0:2:1a88::1.ntp: NTPv4, Client, length 48
21:15:51.803041 IP6 2a01:198:31d:1:7488:d3c2:6218:abb9.ntp > 2001:41d0:2:1a88::1.ntp: NTPv4, Client, length 48
21:15:53.803585 IP6 2a01:198:31d:1:7488:d3c2:6218:abb9.ntp > 2001:41d0:2:1a88::1.ntp: NTPv4, Client, length 48

NTP Version on dedicatet server comes from Debian:
version="ntpd 4.2.4p4 at 1.1520-o Sun Nov 22 16:14:34 UTC 2009 (1)"
processor="x86_64", system="Linux/2.6.32.2-xxxx-grs-ipv6-64"

My home Linux run ubuntu 10.10:
version="ntpd 4.2.4p8 at 1.1612-o Fri Apr  9 00:28:40 UTC 2010 (1)",
processor="i686", system="Linux/2.6.32-26-generic-pae"

Thanks in advance.

Best regards
Marc-Andre Alpers




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