NTP in AIX


 
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Operating Systems AIX NTP in AIX
# 1  
Old 07-22-2013
IBM NTP in AIX

Hello Everyone,

I got a question regarding NTP (Network time protocal) in AIX.

AIX is new in our environment. so' we do not have any time server that is useful for new LPARs.
so' i tried using IBM steps to configure NTP server on one of our test/lab LPARs.

I used the below link to make it work. But it did not working.

IBM Configuring NTP on AIX 5L - United States


ON one of AIX LPAR --> to make it as NTP server
Code:
[root@LPAR1]> tail -7 /etc/ntp.conf
#   Broadcast client, no authentication.
#
#broadcastclient
server 127.127.1.0
driftfile /etc/ntp.drift
tracefile /etc/ntp.trace
--

[root@LPAR1]/>lssrc -ls xntpd
 Program name:    /usr/sbin/xntpd
 Version:         3
 Leap indicator:  00 (No leap second today.)
 Sys peer:        127.127.1.0
 Sys stratum:     4
 Sys precision:   -18
 Debug/Tracing:   DISABLED
 Root distance:   0.000000
 Root dispersion: 0.010010
 Reference ID:    127.127.1.0
 Reference time:  d597cdae.de0e3000  Mon, Jul 22 2013 11:26:38.867
 Broadcast delay: 0.003906 (sec)
 Auth delay:      0.000122 (sec)
 System flags:    pll monitor filegen
 System uptime:   1576 (sec)
 Clock stability: 0.000000 (sec)
 Clock frequency: 0.000000 (sec)
 Peer: 127.127.1.0
      flags: (configured)(refclock)(sys peer)
      stratum:  3, version: 3
      our mode: client, his mode: server
Subsystem         Group            PID          Status
 xntpd            tcpip            8585346      active

another LPAR (Client)
Code:
[root@LPAR2]/>ntpdate -d 127.127.1.0
22 Jul 11:24:58 ntpdate[9437240]: 3.4y
transmit(127.127.1.0)
transmit(127.127.1.0)
transmit(127.127.1.0)
transmit(127.127.1.0)
transmit(127.127.1.0)
server 127.127.1.0, port 123
stratum 0, precision 0, leap 00, trust 000
refid [0.0.0.0], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time:      00000000.00000000  Thu, Feb  7 2036  1:28:16.000
originate timestamp: 00000000.00000000  Thu, Feb  7 2036  1:28:16.000
transmit timestamp:  d597cd4d.f8c23000  Mon, Jul 22 2013 11:25:01.971
filter delay:  0.00000  0.00000  0.00000  0.00000
               0.00000  0.00000  0.00000  0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
               0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000

22 Jul 11:25:02 ntpdate[9437240]: no server suitable for synchronization found
[root@LPAR2]/>

error: " If you get the message, "no server suitable for synchronization found", verify xntpd is running on the server (see above) and that no firewalls are blocking port 123"

i did verified.........

1) xntp is running on LPAR1 (NTP server)
2) date and time also almost same on both LPARs (just a sec/ 2 sec difference)
3) I do not know, how to check whether any firewall is blocking PORT 123

please give me any command to verify that.


client
Code:
[root@LPAR2]/>cat /etc/services | grep -i 123
ntp                             123/tcp         # Network Time Protocol
ntp                             123/udp         # Network Time Protocol

[root@LPAR2]/>netstat -an | grep 123
udp4       0      0  127.0.0.1.123          *.*
udp4       0      0  10.116.237.226.123     *.*
udp4       0      0  *.123                  *.*
[root@LPAR2]/>

server
Code:
[root@LPAR1]/>netstat -an | grep -i 123
udp4       0      0  127.0.0.1.123          *.*
udp4       0      0  10.116.237.226.123     *.*
udp4       0      0  *.123                  *.*
[root@LPAR1]/>netstat -an | grep 123
udp4       0      0  127.0.0.1.123          *.*
udp4       0      0  10.116.237.226.123     *.*
udp4       0      0  *.123                  *.*
[root@LPAR1]/>

Can you please help me resolve/setup NTP. I do not have any existing timeservers here. please let me know if i need to provide any details.


Thanks,

Last edited by System Admin 77; 07-23-2013 at 10:29 AM.. Reason: Use code tags, please...
# 2  
Old 07-23-2013
I would suggest that you have the wrong server IP address coded. Could you use a DNS name instead anyway? I have this coded:-
Code:
broadcastclient
driftfile /etc/ntp.drift
tracefile /etc/ntp.trace
server my-server1.mydomain.co.uk version 3 prefer
server my-server2.mydomain.co.uk version 3 prefer

The DNS names resolve to the public IP addresses (not internet public, just public within our organisation) rather than the 127...... address you have. I'm not sure that this would route to the other servers. It is odd that you are trying an address 127.127.1.0. Why do you have that? I think the 127....... addresses are considered special and reserved, and probably not routed.

Can you show us the output from:-
Code:
ifconfig -a
netstat -rn | grep default



Thanks, in advance,
Robin
Liverpool/Blackburn
UK
This User Gave Thanks to rbatte1 For This Post:
# 3  
Old 07-23-2013
@robin
thanks for your response. And it has been resolved now,

i did a mistake.
on client side, i ran the following command
ntpdate -d 127.127.1.0
instead of using " ntpdate -d ip.address.of.server"

clients and server, in sync now. everything looks good

thanks much!
This User Gave Thanks to System Admin 77 For This Post:
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