Technical data

5.1.4 Configuring the Local Host
As the system manager of the local host, you determine which network hosts to
use for synchronization and for populating an NTP configuration file with a list of
the participating hosts.
You can configure NTP hosts in one or more of the following modes:
• Client/server mode
This mode indicates that the local host wants to obtain time from the remote
server and is willing to supply time to the remote server, if necessary. This
mode is appropriate in configurations that involve a number of redundant
time servers interconnected through diverse network paths. Most internet
time servers use this mode.
• Client mode
This mode indicates that the local host wants to obtain time from the remote
server but it is not willing to provide time to the remote server. Client mode
is appropriate for file server and workstation clients that do not provide
synchronization to other local clients. In general, hosts with a higher stratum
use this mode.
• Broadcast mode
This mode indicates that the local server will send periodic broadcast messages
to a client population at the broadcast/multicast address specified. Normally,
this specification applies to the local server that is operating as a sender. To
specify broadcast mode, use a broadcast declaration in the configuration file.
For information about additional modes, refer to the TCP/IP Services release notes.
5.1.5 Using the Distributed Time Synchronization Service (DTSS)
Your system might be using the Distributed Time Synchronization Service (DTSS).
DTSS is provided as an option with DECnet-Plus and the Distributed Computing
Environment (DCE). If you are using DTSS, you must use the procedures supplied
with DTSS to set time zone information.
If you are running Version 7.3 or later, you can disable DTSS in favor of running
NTP. Define the logical name NET$DISABLE_DTSS to keep DECnet-Plus DECdts
from starting.
5.2 Routing
Routing is the act of forwarding datagrams based on information stored in a routing
table. Routing allows traffic from your local network to reach its destination
elsewhere on the internet. Hosts and gateways on a network use routing protocols
to exchange and store routing information.
If the hosts on your network need to communicate with computers on other
networks, a route through a gateway must be defined. All hosts and gateways on a
network store information about routes in routing tables. With TCP/IP Services,
routing tables are maintained on the disk and in dynamic memory.
The TCP/IP Services product provides two types of routing. You can define routes
manually (static routing), or you can enable routing protocols that exchange
information and build routing tables based on the exchanged information
(dynamic routing).
Network Server Services 5–3