crastart*.conf

Replace the following part:

... PARM(&CRAPRM1. &CRAPRM2.)

with this (where TCPIP represents the desired TCP/IP stack):

... PARM(ENVAR("_BPXK_SETIBMOPT_TRANSPORT=TCPIP") / &CRAPRM1. &CRAPRM2.)

Note: CRASTART does not support line continuations, but there is no limit on the accepted line length.