使用本地NTP服务

使用本地NTP服务

我试图让一个没有外部互联网访问的系统(A)从局域网上另一个可以访问互联网的系统获取时间(B)。

在A的ntp.conf(整个内容在底部)中,我添加了:

server 192.168.2.102
restrict 192.168.2.102

参考B的IP。经过一个小时的阅读手册页、查看在线示例等之后,据我所知,这应该意味着它将使用该本地服务器,并信任它做任何事情。

然而,这不起作用。我可以在 中观看两个交换时间wireshark,并ntpq -p在 A 上运行显示:

remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
192.168.2.102   .INIT.      16 u   16   64    0    0.000    0.000   0.000

如果我ntpd在 A 上停止并尝试ntpd -gq,我可以再次在wireshark中来回观看,但一两分钟后命令超时并显示“未找到服务器”。

我什至尝试添加到 A 的配置中:

fudge 192.168.2.102 stratum 1

没有任何区别。

如何强制 ntpd 设置特定服务器的时间? 看起来这曾经很容易使用ntpdate——它已被贬值并且在系统上不存在。


这是机器 A 的整个 ntp.conf。这是 Debian 的老版本。我所做的唯一更改是添加涉及 192.168.2.102 的行,并注释掉 debian 池服务器以尝试消除那里的混乱,因此无论如何它们都是无法访问的。

# /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


# You do need to talk to an NTP server or two (or three).
#server ntp.your-provider.example
server 192.168.2.102
restrict 192.168.2.102
fudge 192.168.2.102 stratum 1

# pool.ntp.org maps to about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
# pool: <http://www.pool.ntp.org/join.html>
#server 0.debian.pool.ntp.org iburst
#server 1.debian.pool.ntp.org iburst
#server 2.debian.pool.ntp.org iburst
#server 3.debian.pool.ntp.org 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
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# 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

答案1

像下面这样的东西应该有效。

restrict default ignore
restrict 127.0.0.1 nomodify

restrict 192.168.2.102 mask 255.255.255.0 nomodify notrap noquery
server 192.168.2.102 burst iburst

server 127.127.1.0
fudge  127.127.1.0 stratum 10

答案2

我确实让它工作了,所以对于后代来说,#ntp(freenode)上有人说如果 B 没有报告自己已同步,机器 A 可能会不高兴。这可以通过ntpq -pB 上不显示任何带有星号前缀的服务器来观察到。

捏造当地消息来源(通过检查系统时钟实际上确实同步)更正了:

server 127.127.1.0
fudge  127.127.1.0 stratum 10

然而,重要的是不是这样做A因为它比“本地同步”机器 B 更信任第 10 层。

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