Technical data

Setting Up and Managing TELNETSYM
23.5 Managing and Customizing Your Print Queues
This logical name is not used by the server; it is used by the TELNET client.
If you are changing this logical name, then there is no need to restart TCP/IP
Services. If this logical is defined, the KEEPALIVE function is enabled.
By default, the KEEPALIVE timer is disabled. Broken connections will be
detected only when the relevant application sends data.
• TCPIP$TELNETSYM_DROPTIME
The DROP timer indicates how long a connection should be maintained (after
repeated timeouts) before closing the connection. The DROP timer is in
effect only after the link has been established, and it takes effect only if the
KEEPALIVE logical is also defined.
You control the DROP timer using the following command:
$ DEFINE/SYS TCPIP$TELNETSYM_DROP x
where x specifies the number of seconds to hold the connection before closing
it.
The default value for the DROP timer is 300 seconds.
Note that the value for the DROP timer must be greater than the value for
the PROBE timer. When you define only one of these TELNETSYM logical
names, the default value will be used for the other logical name.
• TCPIP$TELNETSYM_PROBETIME
This logical name allows you to control the PROBE timer.
The PROBE timer defines:
When establishing an initial connection, the number of seconds TCP/IP
Services will wait for a response before a timeout occurs. You can enable
this function even if the KEEPALIVE timer is disabled.
The length of time allowed to pass before TCP/IP Services checks an
idle connection. This function requires that the KEEPALIVE timer be
enabled.
You control the PROBE timer using the following command:
$ DEFINE/SYS TCPIP$TELNETSYM_PROBE x
In this command, x specifies the number of seconds to wait before timing out
the connection.
The value of the PROBE timer must always be less than or equal to the value
of the DROP timer. The default value for the PROBE timer is 75 seconds.
• TCPIP$TELNETSYM_SNDBUF
Specifies the size of the socket send buffer that TELNETSYM uses.
23.5.4 Establishing a TELNETSYM Link
If a network link has not been established, the TELNET symbiont attempts
to establish one. Printing starts when the link is successfully established.
The TELNET symbiont continues to try to establish a network link until it is
successful or until a retry interval you define has expired.
The logical name TCPIP$TELNETSYM_RETRY_INTERVAL defines the time for
TELNETSYM to wait between link-establishment retries when link establishment
has failed. The value for this logical name is an OpenVMS delta time.
23–6 Setting Up and Managing TELNETSYM