Visara LINCS Features - Manual (Page 38)

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LINCS Features
707021-001
TCP/IP Configuration and Management
Configuration – This section defines the Configuration utilities used to define TCP/IP host
connections. The TELNET Host Menu in Configuration (Submenu-list) also guides you through
these utilities.
The Line Options utility is where you enable TCP/IP on a line. If TCP/IP is enabled, a TCP/IP
Options panel will be displayed following the Line Options panel, to allow configuration of
TELNET Host Connections, as well as other IP Host parameters.
The IP Host Classes utility is used to pre-define the IP Addresses, and to assign names to those
addresses. Defining classes provides a simple and secure method of allowing dynamic
connections to IP Hosts.
Refer to ASCII Host Connectivity for a description of other ASCII Host configuration utilities.
Management – TCP/IP menu in Central Control under the Communications menu allows
you to examine TCP information, such as:
• ARP table – shows LINCS’ mapping of IP addresses to LAN MAC addresses
• TCP Socket status – shows the TCP port, board port id, session and socket information
• IP status – examine and clear summary counters
• DNS local cache – examine and update the local name server data
You can also manage LPD queues using Central Control utilities. From the Device Menu, you
can view and delete print jobs in LDP queues.
The Device Menu also provides panels to display host and 3270 LU connections information.
There you can find out about TELNET and TN3270 sessions.
The SMS Server Data panel under the Network Management menu displays information about
TELNET and TN3270 servers that LINCS has found.
The Gateway Circuit Status panel under the Communications menu gives you the status of
gateway connections. You can check any gateway connection, including any IP lines.
The Event Logs menu lets you view log entries for gateway circuit and host events, which
includes IP hosts and gateway circuits using IP lines.
DNS
The Domain Name Service is an application layer protocol that runs on top of TCP/IP. This
naming service associates information (host names) with objects (Internet addresses). The
main function of DNS is to retrieve and provide information about hosts on the Internet network
by querying and answering queries. The feature allows you to establish a session with a TCP/
IP host by entering a host name or Internet address, instead of the class name or class number
on the TCP/IP Connect panel.
There are two basic components of DNS, the name resolver and the name server. LINCS will
be acting as a client to the name server on the Internet network. LINCS will be running client
software called a resolver. The name resolver’s function is to resolve user queries. The resolver
needs to know the address of at least one name server.