User guide

SNTP features SNTP
5-93
iMG/RG Software Reference Manual (System Administration)
1 | alliedtelesyn.com
---------------------------
5.2.4.1.8 DNSCLIENT LIST SERVERS
Syntax DNSCLIENT LIST SERVERS
Description This command lists the server IP addresses that you have added to DNS client using the
DNSCLIENT ADD SERVER command. DNS client uses this list to retrieve a domain
name for a given IP address.
Example --> dnsclient list servers
DNS Client Servers:
ID | IP Address
----|------------------
1 | 192.168.100.7
2 | 192.168.100.1
------------------------
5.3 SNTP
The SNTP Version 4 client is an OSI Layer 7 application that allows the synchronization of gateway system clock
to global sources of time-based information using UDP.
Its detailed implementation, which is described in RFC 2030, provides a complete and simplified method to
access international time servers to receive, organize and adjust the time-synchronization of the local system.
The SNTP client described herein is a scaled down version of the Network Time Protocol (NTP) which is spec-
ified in RFC 1305. The main difference between an SNTP and an NTP client is the fact that most SNTP clients
will interact with, at most, a single (S)NTP server. Also, SNTP Version 4 clients include an ‘anycast’ mode in
addition to unicast and broadcast access modes not available in past versions of NTP/SNTP clients
5.3.1 SNTP features
The following features are available on the gateway:
• Boot time and runtime synchronization of the system clock can both be configured
• SNTP in the gateway system can function in one of three transfer modes:
• Unicast Mode
The SNTP client sends to a server, located at a specific previously configured address, a request for time
synchronization and expects a reply only from that particular server
• Broadcast /Multicast Mode
A multicast NTP server periodically transmits a message to the local subnet broadcast address. The cli-