Running OSI applications over TCP/IP (RFC1006) is automatically enabled when you install and configure DECnet. To enable DECnet over TCP/IP (RFC1859), you can either run "decnetsetup advanced" and answer "yes" to the question "Do you want to configure DECnet over TCP/IP?" or you can run dxdecnetsetup, select the advanced format, and select the "Configure DECnet over TCP/IP" option.