Debian
超時，在 ntpdc> loopinfo 上沒有收到任何資訊？
一切似乎都適用於這個命令ntpq -pn，它告訴我：
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和ntpdate -d 192.168.1.231告訴我：
24 Mar 15:40:25 ntpdate[12564]: ntpdate 4.2.8p4@1.3265-o 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在最後一行“找不到適契約步的伺服器”如何使它成為“找到”
即使我嘗試使用此命令ntdc：
root@Lab-X230:/home/igor# ntpdc ntpdc> peers localhost: timed out, nothing received ***Request timed outroot@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 APIexpextation 應遵循此連結 5.1.3.3 http://www.ntp.org/ntpfaq/NTP-s-algo.htm#Q-ACCURATE-CLOCK，例如：
ntpdc> loopinfo offset: -0.000102 s frequency: 16.795 ppm poll adjust: 6 watchdog timer: 63 s
基本上，這是因為
ntpq使用“模式 6”查詢並ntpdc使用“模式 7”查詢（這兩個名稱都來自 NTP 協議中的一個欄位）。模式 7 查詢（和ntpdc）預設情況下已棄用和禁用。嘗試使用
ntpq命令rv、kerninfo和sysinfo來提供所有資訊（以及更多資訊）。如果您必須使用ntpdc，那麼您可以重新啟用模式 7（上面連結中的說明，但要注意它是過去安全問題的根源）。至於
ntpdate -d 192.168.1.231，假設這是這個NTP伺服器的IP地址，我建議檢查防火牆規則。您似乎沒有noserve或ignore在您的配置中。另請注意，這ntpdate大部分已被棄用，而是ntpd有一個-q選項。