I-Data ReRouter instruction manual 2 TCP/IP KeepAlive configuration on OS/2

Installation and Setup ida ReRouter

4.3.2TCP/IP KeepAlive configuration on OS/2

∙OS/2 2.0 with APAR IR28716 fix must be installed.

∙TCP/IP 2.0 with CSD UN64092 or later must be installed.

∙The TCP/IP "inetcfg" command can be used to configure the "KEEPALIVE" parameter.

inetcfg KEEPALIVE=nnn

where nnn is the number of minutes a TCP connection must remain inactive before TCP generates a KEEPALIVE transmission for an application that requests them.

The default is 120 minutes.

The inetcfg command must be run each time the OS/2 system is started. Adding the inetcfg command to \tcpip\bin\tcpstart.cmd is a convenient way to automate this step.

For example, adding

inetcfg KEEPALIVE=4

to \tcpip\bin\tcpstart.cmd causes TCP to send a KEEPALIVE transmission if a TCP connection has been inactive for 4 minutes and the application requested KEEPALIVE transmissions, as OS/2 now does. OS/2 recommends this TCP configuration setting for customers who use TCP/IP-attached printers and the device.

If the KEEPALIVE transmission is not acknowledged, the TCP will attemt to re-connect up to 9 times. The interval between these attempts is fixed but short.

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