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PSF/AIX Printing Using TCP/IP
Xerox 4500 PS ETH, Inst. & Operator's Guide
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18.2 KEEPALIVE support for AIX
The TCP/IP components in AIX offer network attachment for printers.
However, these TCPIP components do not always detect connection
failures if a point-to-point session between the AIX machine and the
device has failed (e.g. in connection with a printer being abruptly
powered off). This may result in serious problems for IPDS printers in
sessions with PSF/AIX
Now, support for the TCP KEEPALIVE facility has been added to the
TCP/IP components of AIX to detect all communication failures.
PSF/AIX directs TCP to send a KEEPALIVE transmission on a TCP
connection remaining inactive for an extended period. If the
KEEPALIVE transmission is not acknowledged, the TCP assumes that
the connection partner has been lost and subsequently reports a failure
to PSF/AIX
The frequency of these transmissions depends upon the configuration
of AIX TCP/IP environment. The default for AIX is two hours or more.
This, however, can be adjusted. These values apply to all TCP
applications that request KEEPALIVE transmissions.
In the following, you are provided with instructions for using the
KEEPALIVE support facility added to the TCP/IP components for AIX
18.3 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
where 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).