> From the comments in the file, after the system ID, there are two > tokens on each line: > > the userid of the TCP/IP virtual machine (which apparently > is automatically filled in if you put in "TCPIPUSERID") > the default userid > > I don't understand where these values are used. Can you elaborate?
The system id string (the 'nnnnn': part) is matched against the values in SYSTEM NETID, and then the remainder of the line is the configuration parameter to apply to the TCPIP configuration if the current system id matches nnnnnn. So, if you bring up CP on your DR system and the CPUID for that system is properly registered in SYSTEM NETID, the system id will be DRSYS1, and that system will use TCPIPUSERID TCPDR as the configuration line (that's the statement that tells the clients what virtual machine running the TCP stack to connect to via IUCV when they need to send packets out to the net) when it processes TCPIP DATA. If the system id is the normal SYSID1, then TCPIPUSERID TCPIP is used. This particular value (TCPIPUSERID) isn't probably one that would change if you're bringing up YOUR CP on different hardware (you'd just get your normal TCPIP userid), but the same trick with the systemid can be used for NSINTERADDR and other configuration parameters to point at the right DNS, change host names, etc.
