RHEL5.2上配置NTP时间服务器

一 服务器配置NTP 其IP为172.17.167.30和10.31.255.30

[root@localhost ~]# vi /etc/ntp.conf
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
#restrict default kod nomodify notrap nopeer noquery
#restrict -6 default kod nomodify notrap nopeer noquery
#restrict default nomodify noquery notrap
#restrict default ignore
#restrict 202.112.10.60

# Permit all access over the loopback interface.  This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
#restrict -6 ::1

# Hosts on local network are less restricted.
restrict 10.31.255.0 mask 255.255.255.0 nomodify
restrict 172.17.167.0 mask 255.255.255.0 nomodify notrap
#restrict 0.0.0.0 mask 0.0.0.0 notrap noquery notrust

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool ().
server time.buaa.edu.cn prefer
server time.buptnet.edu.cn
#broadcast 192.168.1.255 key 42         # broadcast server
#broadcastclient                        # broadcast client
#broadcast 224.0.1.1 key 42             # multicast server
#multicastclient 224.0.1.1              # multicast client
#manycastserver 239.255.254.254         # manycast server
#manycastclient 239.255.254.254 key 42  # manycast client
 
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server  127.127.1.0     # local clock
fudge   127.127.1.0 stratum 10
 
# Drift file.  Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
driftfile /var/lib/ntp/drift
broadcastdelay  0.008
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
 
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
 
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
 
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
--------------------
[root@localhost ~]# cat /etc/ntp/step-tickers
time.buaa.edu.cn
============================

[root@localhost ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*202.112.128.33  210.72.145.44    2 u  301  512  377  122.333   -0.907  16.022
 202.112.10.60   .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 LOCAL(0)        .LOCL.          10 l   20   64  377    0.000    0.000   0.001
=============================

[root@localhost ~]# lsof -i:123
COMMAND   PID USER   FD   TYPE DEVICE SIZE NODE NAME
ntpd    23021  ntp   16u  IPv4 649101       UDP *:ntp
ntpd    23021  ntp   17u  IPv6 649102       UDP *:ntp
ntpd    23021  ntp   18u  IPv6 649103       UDP [fe80::20f:eaff:fe56:9156]:ntp
ntpd    23021  ntp   19u  IPv6 649104       UDP localhost6.localdomain6:ntp
ntpd    23021  ntp   20u  IPv6 649105       UDP [fe80::20f:eaff:fe56:9157]:ntp
ntpd    23021  ntp   21u  IPv6 649106       UDP [fe80::fcff:ffff:feff:ffff]:ntp
ntpd    23021  ntp   22u  IPv6 649107       UDP [fe80::fcff:ffff:feff:ffff]:ntp
ntpd    23021  ntp   23u  IPv6 649108       UDP [fe80::200:ff:fe00:0]:ntp
ntpd    23021  ntp   24u  IPv4 649109       UDP localhost:ntp
ntpd    23021  ntp   25u  IPv4 649110       UDP 10.31.255.22:ntp
ntpd    23021  ntp   26u  IPv4 649111       UDP 10.31.255.20:ntp
ntpd    23021  ntp   27u  IPv4 649116       UDP 10.31.255.23:ntp
ntpd    23021  ntp   28u  IPv4 649117       UDP 10.31.255.21:ntp
ntpd    23021  ntp   29u  IPv4 649118       UDP 172.17.167.30:ntp
ntpd    23021  ntp   30u  IPv4 649119       UDP 192.168.122.1:ntp
ntpd    23021  ntp   31u  IPv4 649120       UDP 10.31.255.30:ntp
ntpd    23021  ntp   32u  IPv4 649121       UDP 10.8.0.1:ntp
================================

[root@localhost ~]# netstat -unl | grep 123
udp        0      0 10.8.0.1:123                0.0.0.0:*                              
udp        0      0 10.31.255.30:123            0.0.0.0:*                              
udp        0      0 192.168.122.1:123           0.0.0.0:*                              
udp        0      0 172.17.167.30:123           0.0.0.0:*                              
udp        0      0 10.31.255.21:123            0.0.0.0:*                              
udp        0      0 10.31.255.23:123            0.0.0.0:*                              
udp        0      0 10.31.255.20:123            0.0.0.0:*                              
udp        0      0 10.31.255.22:123            0.0.0.0:*                              
udp        0      0 127.0.0.1:123               0.0.0.0:*                              
udp        0      0 0.0.0.0:123                 0.0.0.0:*                              
udp        0      0 fe80::200:ff:fe00:0:123     :::*                                   
udp        0      0 fe80::fcff:ffff:fef:123     :::*                                   
udp        0      0 fe80::fcff:ffff:fef:123     :::*                                   
udp        0      0 fe80::20f:eaff:fe56:123     :::*                                   
udp        0      0 ::1:123                     :::*                                   
udp        0      0 fe80::20f:eaff:fe56:123     :::*                                   
udp        0      0 :::123                      :::* 

=========================
二 客户端可是windows或linux

ntpdate 172.17.167.30