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frankfalse
Asked: 2023-07-06 18:36:14 +0800 CST

为什么timesyncd客户端没有收到NTP服务器的任何回复（回复超时）？

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在我的 lubuntu 22.04 中激活了该服务systemd-timesyncd。这是该服务的状态：

> systemctl status systemd-timesyncd

# this is the output of the previous command:
● systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2023-07-06 12:21:43 CEST; 2min 54s ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 1917 (systemd-timesyn)
     Status: "Idle."
      Tasks: 2 (limit: 2030)
     Memory: 1.3M
        CPU: 201ms
     CGroup: /system.slice/systemd-timesyncd.service
             └─1917 /lib/systemd/systemd-timesyncd

lug 06 12:21:55 ceia-te systemd-timesyncd[1917]: Timed out waiting for reply from 185.125.190.57:123 (ntp.ubuntu.com).
lug 06 12:22:05 ceia-te systemd-timesyncd[1917]: Timed out waiting for reply from 185.125.190.58:123 (ntp.ubuntu.com).
lug 06 12:22:15 ceia-te systemd-timesyncd[1917]: Timed out waiting for reply from 185.125.190.56:123 (ntp.ubuntu.com).
lug 06 12:22:25 ceia-te systemd-timesyncd[1917]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).

输出显示该服务正在运行并尝试连接到 NTP 服务器ntp.ubuntu.com，但没有收到任何回复（请参阅 messages Timed out waiting for reply from ntp.ubuntu.com）；通过 ping 可以访问该服务器，我们可以通过以下命令的输出看到：

> ping ntp.ubuntu.com
PING ntp.ubuntu.com (91.189.94.4) 56(84) bytes of data.
64 bytes from pugot.canonical.com (91.189.94.4): icmp_seq=1 ttl=53 time=30.0 ms
64 bytes from pugot.canonical.com (91.189.94.4): icmp_seq=2 ttl=53 time=29.8 ms
64 bytes from pugot.canonical.com (91.189.94.4): icmp_seq=3 ttl=53 time=29.8 ms

防火墙iptables未激活：

> sudo iptables --list
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

有人可以告诉我为什么 timesyncd 客户端没有收到来自 NTP 服务器的任何回复吗ntp.ubuntu.com？

谢谢

networking

1 个回答

  1. Best Answer

    问题出在互联网服务提供商身上

    感谢您的评论。我尝试连接到另一个网络，该网络能够通过我撰写帖子时使用的网络的其他方式连接到互联网。
    通过另一个网络并且无需对配置文件进行任何修改，/etc/systemd/timesyncd.conf即：

    [Time]
#NTP=
#FallbackNTP=ntp.ubuntu.com
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048

    NTP客户端systemd timesyncd可以将系统日期同步到NTP服务器ntp.ubuntu.com。

    事实上服务的状态systemd-timesyncd.service如下：

    systemctl status systemd-timesyncd
● systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2023-07-06 14:12:48 CEST; 46min ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 2065 (systemd-timesyn)
     Status: "Initial synchronization to time server 185.125.190.56:123 (ntp.ubuntu.com)."
      Tasks: 2 (limit: 2030)
     Memory: 1.3M
        CPU: 203ms
     CGroup: /system.slice/systemd-timesyncd.service
             └─2065 /lib/systemd/systemd-timesyncd

lug 06 14:12:48 ceia-te systemd[1]: Starting Network Time Synchronization...
lug 06 14:12:48 ceia-te systemd[1]: Started Network Time Synchronization.
lug 06 14:12:13 ceia-te systemd-timesyncd[2065]: Initial synchronization to time server 185.125.190.56:123 (ntp.ubuntu.com).

    因此，无需对 lubuntu 配置进行任何修改，也无需安装任何其他软件包，系统即可正常工作。

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