'ntpq> peers' gives error "Request timed out" after upgrading to ntp-4.2.6p5 package.
Environment
- Red Hat Enterprise Linux 6.5
- ntp-4.2.6p5-1.el6
Issue
- 'ntpq> peers' gives error "Request timed out" after upgrading to ntp-4.2.6p5 package.
[root@ntp-4.2.6 ~]# ntpq
ntpq> peer
localhost: timed out, nothing received
***Request timed out
Resolution
- Make changes as below in /etc/ntp.conf file and restart ntpd service:
either change "restrict default ignore" to "restrict -4 default ignore"
or change "restrict 127.0.0.1 mask 255.255.255.255" to "restrict localhost"
Root Cause
- With earlier package of ntp, "restrict default ignore" restricted only IPv4.
Diagnostic Steps
- From test setup with earlier ntp package:
[root@ntp-4.2.4 ~]# rpm -qa | grep ntp
ntpdate-4.2.4p8-2.el6.x86_64
ntp-4.2.4p8-2.el6.x86_64
[root@ntp-4.2.4 ~]# cat /etc/ntp.conf
restrict default ignore
restrict 127.0.0.1 mask 255.255.255.255
[root@ntp-4.2.4 ~]# ntpq
ntpq> peers
remote refid st t when poll reach delay offset jitter
==============================================================================
+clock.util.phx2 .CDMA. 1 u 82 128 377 311.936 0.384 69.294
*clock02.util.ph .CDMA. 1 u 79 128 377 312.247 0.162 58.144
- Now with latest upgraded version ntp package:
[root@ntp-4.2.6 ~]# rpm -qa | grep ntp
ntp-4.2.6p5-1.el6.x86_64
ntpdate-4.2.6p5-1.el6.x86_64
[root@ntp-4.2.6 ~]# grep -v "^#" /etc/ntp.conf
restrict default ignore
restrict 127.0.0.1 mask 255.255.255.255
[root@ntp-4.2.6 ~]# ntpq
ntpq> peer
localhost: timed out, nothing received
***Request timed out
ntpq>
-
With old package of ntp, "restrict default ignore" restricted only IPv4 and that the reason we had statement restrict -6 default,
i.e it's the default line, before it was applied only to IPv4, now it's applied to both IPv4 and IPv6. -
With the previous package and that configuration the IPv6 access wasn't restricted at all.
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