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On my server, the time should be fetched. It should no be provided to other servers. I would call this a client.

But it seams that NTP is by default running in server mode, since it is opening ports and listening (waiting from packages).

foohost:~ # netstat -tulpen| grep ntp
udp        0      0 10.172.19.11:123        0.0.0.0:*                           0          17756202   28508/ntpd          
udp        0      0 30.251.32.11:123        0.0.0.0:*                           0          17756200   28508/ntpd          
udp        0      0 127.0.0.1:123           0.0.0.0:*                           0          17756198   28508/ntpd          
udp        0      0 0.0.0.0:123             0.0.0.0:*                           0          17756194   28508/ntpd          
udp        0      0 fe80::250:56ff:fe30:123 :::*                                0          17756206   28508/ntpd          
udp        0      0 ::1:123                 :::*                                0          17756204   28508/ntpd          
udp        0      0 :::123                  :::*                                0          17756191   28508/ntpd

How to stop ntp opening ports and listening?

Linux version: SUSE Linux Enterprise Server 12 SP3

NTPD version: ntp-4.2.8p10-63.3.x86_64

guettli
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  • Thank you for down-voting this question. I know this question is annoying and was asked before. But the real problem is the missing sane default value oft ntpd. – guettli Sep 06 '18 at 08:00
  • Not realy understand why using `ntpd` in ought to get time only. You can use `ntpdate` and put it in the cron. – schweik Aug 24 '18 at 11:47

1 Answers1

2

This is just basic NTPd configuration as discussed in many posts here like

How to prevent ntpd to listen on 0.0.0.0:123?

Does NTPd have to listen on an interface or address for updating the server time?

etc.

If you only want to set the server's time, use ntpd (configured to your liking) in combination with sntp.

Lenniey
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