このコマンドですべてがうまくいくようですntpq-pn、これは私に次のことを伝えます。
remote refid st t when poll reach delay offset jitter
==============================================================================
-184.105.182.7 216.218.254.202 2 u 54 64 377 79.218 -11.053 0.466
+69.195.159.158 208.100.0.228 3 u 65 64 377 36.752 -7.735 0.407
-74.120.81.219 128.138.140.44 2 u 64 64 377 34.972 -1.763 16.977
*45.55.102.31 98.175.203.200 2 u 61 64 377 7.723 -3.781 4.854
+91.189.94.4 193.79.237.14 2 u 60 64 377 79.423 -2.344 0.520
そしてntpdate -d 192.168.1.231見せてください：
24 Mar 15:40:25 ntpdate[12564]: ntpdate [email protected] Wed Oct 5 12:34:47 UTC 2016 (1)
Looking for host 192.168.1.231 and service ntp
host found : 192.168.1.231
transmit(192.168.1.231)
transmit(192.168.1.231)
transmit(192.168.1.231)
transmit(192.168.1.231)
transmit(192.168.1.231)
192.168.1.231: Server dropped: no data
server 192.168.1.231, port 123
stratum 0, precision 0, leap 00, trust 000
refid [192.168.1.231], 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: dc7ff4af.1ec5f659 Fri, Mar 24 2017 15:40:31.120
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
24 Mar 15:40:33 ntpdate[12564]: no server suitable for synchronization found
最後の行に「同期に適したサーバーが見つかりません。「それを作る方法」確立された」
このコマンドを使用しようとしても国家発展協議会:
root@Lab-X230:/home/igor# ntpdc
ntpdc> peers
localhost: timed out, nothing received
***Request timed out
root@Lab-X230:/home/igor# sudo vim /etc/ntp.conf
# /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
# Specify one or more NTP servers.
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
#pool 0.ubuntu.pool.ntp.org iburst
#pool 1.ubuntu.pool.ntp.org iburst
#pool 2.ubuntu.pool.ntp.org iburst
#pool 3.ubuntu.pool.ntp.org iburst
# Use Ubuntu's ntp server as a fallback.
#pool ntp.ubuntu.com
server 0.ubuntu.pool.ntp.org iburst
server 1.ubuntu.pool.ntp.org iburst
server 2.ubuntu.pool.ntp.org iburst
server 3.ubuntu.pool.ntp.org iburst
server ntp.ubuntu.com iburst
# 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 limited
"/etc/ntp.conf" 74L, 2669C 26,1 Top
#
# 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 limited
restrict -6 default kod notrap nomodify nopeer noquery limited
# Local users may interrogate the ntp server more closely.
#restrict default ignore
#restrict 127.0.0.1 mask 255.255.255.255
restrict 127.0.0.1
restrict ::1
# Needed for adding pool entries
restrict source notrap nomodify noquery
# 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
#Changes recquired to use pps synchonisation as explained in documentation:
#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918
#server 127.127.8.1 mode 135 prefer # Meinberg GPS167 with PPS
#fudge 127.127.8.1 time1 0.0042 # relative to PPS for my hardware
#server 127.127.22.1 # ATOM(PPS)
#fudge 127.127.22.1 flag3 1 # enable PPS API
指示は5.1.3.3のリンクに従ってください。 http://www.ntp.org/ntpfaq/NTP-s-algo.htm#Q-ACCURATE-CLOCK、例えば：
ntpdc> loopinfo
offset: -0.000102 s
frequency: 16.795 ppm
poll adjust: 6
watchdog timer: 63 s
答え1
ntpqデフォルトでは、これは「モード 6」を使用するクエリと「モード 7」を使用するクエリが原因ですntpdc(両方の名前は NTP プロトコルのフィールドに由来します)。モード7クエリ（およびntpdc）の例デフォルトでは廃止され、無効になっています。。
ntpqコマンドを使用してすべてのrv情報（およびそれ以上）を提供kerninfoします。sysinfo必ず使用する必要がある場合は、ntpdcモード7を再度有効にすることができます（上記のリンクの指示ですが、過去にこれがセキュリティ上の問題の原因であったことに注意してください）。
に関しては、ntpdate -d 192.168.1.231これがこのNTPサーバーのIPアドレスであると仮定し、ファイアウォールルールを確認することをお勧めします。そこにいないか、あなたの構成にないようですnoserve。ignoreまた、これはntpdateほとんど使用されておらず、代替オプションがありntpdます-q。