Dascom TallyCom III IBM AS400/iSeries Host Print Set-up Guide - Manual (Page 25)

In the following, you are provided with instructions for using the KEEPALIVE
support facility added to the TCP/IP components for AIX
5.3 AIX KEEPALIVE support
The no (network options) command can be used by the root user to configure
KEEPALIVE frequencies.
no -o tcp_keepidle=nnn
no -o tcp_keepintvl=nnn
when nnn is in half-seconds.
The command tcp_keepidle specifies the interval of inactivity causing the TCP to
generate a KEEPALIVE transmission for an application that requests them.
The default is 14400 (2 hours).
The command tcp_keepintvl specifies the interval between the nine retry
attempts if a KEEPALIVE transmission is not acknowledged.
The default is 150 (75 seconds).
The no commands must be run each time the AIX system is started. Adding the
no commands to /etc/rc.net is a convenient way of automating this step.
Adding e.g.
no -o tcp_keepidle=480
no
-o tcp_keepintvl=80
to /etc/rc.net causes the TCP to send a KEEPALIVE transmission if a TCP
connection has been inactive for 4 minutes and the application requested
KEEPALIVE transmissions, as AIX now does. AIX recommends these TCP
configuration settings to customers who use TCP/IP attached printers and the
device.
To view current settings enter
no -a
When the installation and configuration procedures for the PSF/AIX have been
completed, you are ready for printing.
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