One server syncs with a public time server. I want to set the other machines on the network (all are RH9) to sync with the first one.
Although I have started ntp on each machine and pointed each machine to the first to synchronise time, they are all running different times.
Am I missing something or is there a bug in here?
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Redhat 9 has incoming NTP blocked for all but the localhost in the /etc/ntp.conf file. A google search for NTP and Redhat should give you some goodies on how to enable incoming NTP on your LAN using a mask. Here's mine. Works great as a server on my LAN. An added bonus is you can sync from Windows boxes over the LAN with SNTP for shorter propagation delay, lower WAN traffic, and better netiquette.
I've attached my ntp.conf file. The interesting one is the one containing 192.168.0.0.
Ryan
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cat /etc/ntp.conf # Prohibit general access to this service. #restrict default ignore
# 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
# -- CLIENT NETWORK ------- # Permit systems on this network to synchronize with this # time service. Do not permit those systems to modify the # configuration of this service. Also, do not use those # systems as peers for synchronization. restrict 192.168.0.0 mask 255.255.255.0 notrust nomodify notrap
# --- OUR TIMESERVERS ----- # or remove the default restrict line # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system.
server ns.nts.umn.edu server nss.nts.umn.edu server ntp-1.cso.uiuc.edu server ntp-1.mcs.anl.gov server ntp3.cs.wisc.edu server tick.usno.navy.mil server tock.usno.navy.mil
# --- NTP MULTICASTCLIENT --- #multicastclient # listen on default 224.0.1.1 # restrict 224.0.1.1 mask 255.255.255.255 notrust nomodify notrap # restrict 192.168.1.0 mask 255.255.255.0 notrust nomodify notrap
# --- GENERAL CONFIGURATION --- # # Undisciplined Local Clock. This is a fake driver intended for backup # and when no outside source of synchronized time is available. The # default stratum is usually 3, but in this case we elect to use stratum # 0. Since the server line does not have the prefer keyword, this driver # is never used for synchronization, unless no other other # synchronization source is available. In case the local host is # controlled by some external source, such as an external oscillator or # another protocol, the prefer keyword would cause the local host to # disregard all other synchronization sources, unless the kernel # modifications are in use and declare an unsynchronized condition. # 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 /etc/ntp/drift #broadcastdelay 0.008
# # Authentication delay. If you use, or plan to use someday, the # authentication facility you should make the programs in the auth_stuff # directory and figure out what this number should be on your machine. # #authenticate yes
# # Keys file. If you want to diddle your server at run time, make a # keys file (mode 600 for sure) and define the key number to be # used for making requests. # # PLEASE DO NOT USE THE DEFAULT VALUES HERE. Pick your own, or remote # systems might be able to reset your clock at will. Note also that # ntpd is started with a -A flag, disabling authentication, that # will have to be removed as well. # #keys /etc/ntp/keys
statistics loopstats statsdir /var/log/ntp/
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