Setup guide

ManualsBrandsD-Link ManualsComputer equipmentDWL-500 - 11Mb Wireless LAN PCI Network Card

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Example

Time Zone

Notes

Example

General Information

Summary

NTP protocol allows synchronizing time among computers in network. It is good if there is an

internet connection available and local NTP server is synchronized to correct time source. List of

publec NTP servers is available at http://www.eecis.udel.edu/~mills/ntp/servers.html

Specifications

Packages required: ntp

License required: level1

system ntp

Standards and Technologies: NTP (RFC 958)

Hardware usage: Not significant

Related Documents

• Package Management

• IP Addresses and ARP

Description

Network Time Protocol (NTP) is used to synchronize time with some NTP servers in a network.

Wandy RouterOS provides both - NTP client and NTP server.

NTP client synchronizes local clock with some other time source (NTP server). There are 4 modes

in which NTP client can operate at:

• unicast (Client/Server) mode - NTP client connects to specified NTP server. IP address of

NTP server must be set in ntp-server and/or second-ntp-server parameters. At first client

synchronizes to NTP server. Afterwards client periodically (64..1024s) sends time requests to

NTP server. Unicast mode is the only one which uses ntp-server and second-ntp-server

parameters.

• broadcast mode - NTP client listens for broadcast messages sent by NTP server. After

receiving first broadcast message, client synchronizes local clock using unicast mode, and

afterwards does not send any packets to that NTP server. It uses received broadcast messages

to adjust local clock.

• multicast mode - acts the same as broadcast mode, only instead of broadcast messages (IP

address 255.255.255.255) multicast messages are received (IP address 224.0.1.1).

• manycast mode - actually is unicast mode only with unknown IP address of NTP server. To

discover NTP server, client sends multicast message (IP 239.192.1.1). If NTP server is

configured to listen for these multicast messages (manycast mode is enabled), it replies. After

client receives reply, it enters unicast mode and synchronizes to that NTP server. But in