> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/protocols/ntp.md).

# NTP

## **Starting from version 2.9, the timezone can be configured from the web portal in the services section:**

## System Configuration

### Network Time Protocol (NTP) configuration

On new units, NTP comes pre-installed and activated by default.

You can use the **tbntpconfig** tool to choose the NTP servers to synchronize the time base of the system.

```

[root@TB000001 ~]# tbntpconfig

###############################################################
# Current NTP servers:
#
 NTP server1 = '0.centos.pool.ntp.org'
 NTP server2 = '1.centos.pool.ntp.org'
 NTP server3 = '2.centos.pool.ntp.org'

Do you want to modify the current NTP servers list (enter 'help' for usage) ?[No] Yes
```

You can also use the manual method as described below.

## Manual configuration

### Installing NTP

```
yum install ntp
```

### Configuring NTP

#### Setting the time zone

Make sure that the host time zone is set properly. To modify the time zone go [here](http://kezhong.wordpress.com/2010/03/08/change-timezone-on-centos-5-4/)

#### Setting the DNS server

Make sure your nameserver (DNS) is configured correctly (see [Modify the dhcp client configuration](https://github.com/telcobridges-main/tmedia-wiki/tree/main/tmedia/operations/how-to-change-the-ip-address/README.md)).

#### Modify NTP Server List (Optional)

Modify your ntp server list

```
vim /etc/ntp.conf
```

Change the server list for those closer to your server. List can be found [here](http://www.pool.ntp.org/en/) Example for Canadian servers:

```
server 0.ca.pool.ntp.org
server 1.ca.pool.ntp.org
server 2.ca.pool.ntp.org
server 3.ca.pool.ntp.org
```

#### Synchronize the host date with the NTP server

**Warning**: This may result is a jump in time of several minutes.

Use ntpdate to synchronize your server time with a NTP server.

Example showing a host synchronization with a Canadian server.

```
ntpdate 0.ca.pool.ntp.org
```

### Start NTP

You can use the following command to enable NTP:

```
chkconfig ntpd on
service ntpd start
```

### Verify NTP server status

To verify the synchronization between the host and the NTP servers:

```
ntpq -p
```

**Note**: After starting the NTP service, the system requires at least 10 minutes to accept a reference server.

Example of host synched with barricade.rack9:

```
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*barricade.rack9 209.51.161.238   2 u 1001 1024  377   31.147   -0.369  20.074
+ip-72-167-42-82 204.123.2.5      2 u  754 1024  377  166.388  -29.692  28.223
+cheezum.mattnor 129.7.1.66       2 u   91 1024  377   45.715    1.504  47.753
```

The '\*' represent the current reference server The '+' represent a potential backup reference server The '-' represent a rejected reference server


---

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