Login or Register to Ask a Question and Join Our Community


Red Hat

NTP Configuration file

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Red Hat NTP Configuration file
# 1  
Old 03-12-2013
NTP Configuration file
Hi,
Could you please explain about "restrict" parameters in /etc/ntp.conf in ntp client and ntp Servers.

Example:

restrict 127.0.0.1
restrict -6 ::1
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap


Regards,
Mastan
# 2  
Old 03-12-2013
"restrict" always expects an IP address (and optionally a netmask) and a flag. If no flags are specified it means there are no restrictions to the access you're providing (full access).

So, the first two lines means you are giving full unrestricted access to localhost with both IPv4 and IPv6 addresses.

The second line gives access to the whole subnet 192.168.1.0/24, with the exception of modifying the time (nomodify) or querying the ntpq subsystem (notrap) which is used in some cases to get logging information from the remote hosts; everything else is allowed.

Take a look at man ntp.conf for detailed info.
Last edited by verdepollo; 03-12-2013 at 03:29 PM..
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Red Hat

Ntp client sync with local over ntp server

Hi, I have two ntp servers in my cluster and I want all the nodes in my cluster to sync with either of the ntp servers or just one. Unfortunately it keep rotating the sync, between my ntp server 1, ntp server 2 and local. Is there anyway I can change the sync to avoid local? # ntpq -p ... (3 Replies)
Discussion started by: pjeedu2247
3 Replies

2. Solaris

ntp client configuration error

hi all ntp client side configuration file is done but in # ntpq -p remote refid st t when poll reach delay offset disp ============================================================================== ntpserver .INIT. 16 u - 64 0 0.00 0.000... (5 Replies)
Discussion started by: nikhil kasar
5 Replies

3. HP-UX

Setting up NTP HP-UX clients from solaris NTP server

Hi I wonder if its possible to setup NTP clients running HP-UX o.s. from a solaris 10 NTP server? FR (3 Replies)
Discussion started by: fretagi
3 Replies

4. UNIX for Dummies Questions & Answers

NTP configuration issue..

hello Guys, I have an NTP problem on my SUN N240 server. External NTP server is being used for this box and when i run 'ntpq -p' i get connection refused message; ntpq -p ntpq: read: Connection refused Here this is the ntp.conf file: cat /etc/ntp.conf # BEGIN NTP SERVERS server... (6 Replies)
Discussion started by: dyavuzy1
6 Replies

5. Linux

How often does Linux NTP server update its time with the external NTP server?

All here, thank you for listening. Now I've set up a Linux NTP server by adding a external windows NTP server in /etc/ntp.conf. Then I start the ntpd daemon. But how often does the Linux NTP server update its time with the external NTP server? I've looked up everywhere but found no information... (1 Reply)
Discussion started by: MichaelLi
1 Replies

6. Solaris

ntp server configuration

hi Please give me the configuration steps for NTP server. How do i sync other servers with this NTP server thanks to all (1 Reply)
Discussion started by: sijocg
1 Replies

7. Red Hat

NTP Configuration on RHEL 5.4

Hi, I'm trying to configure NTP client, however it failes to sync correctly. Even after I manually set the time, once it connects with the NTP server, it pushes the time ahead by 4 hours. We have set an AIX host as NTP server. It works fine for other AIX hosts, however fails on RHEL 5.4 ... (4 Replies)
Discussion started by: max_min
4 Replies

8. Shell Programming and Scripting

Extracting data from text file based on configuration set in config file

Hi , a:) i have configuration file with pattren <Range start no>,<Range end no>,<type of records to be extracted from the data file>,<name of the file to store output> eg: myfile.confg 9899000000,9899999999,DATA,b.dat 9899000000,9899999999,SMS,a.dat b:) Stucture of my data file is... (3 Replies)
Discussion started by: suparnbector
3 Replies

9. Solaris

ntp server and ntp client

All, How do you set a Solaris 9 server which received ntp updates from a ntp server to broadcast them on a local subnet. I have created a /etc/inet/ntp.conf file to receive the updates from a server on network and need to make this server become like a ntp relay from the main server. Any... (1 Reply)
Discussion started by: bubba112557
1 Replies

10. UNIX for Dummies Questions & Answers

ntp configuration

Hi all, I'm sure this question was asked before but I couldn't find what I was looking for in the 2 threads I found on here. Here's my question/problem: I have an isolated (no connection to outside world at all) Unix network. I want to have time sync between my other non-PC based system... (0 Replies)
Discussion started by: mariobernier
0 Replies
Login or Register to Ask a Question