IBM - 4690 OS and communication with S/390 using SNA via WAN with routers to provide 3270 sessions
Problem
I want to know the specific configuration to communicate to a 4690 OS store controller with IBM® Mainframe S/390® using SNA via WAN where routers are included, to provide 3270 sessions. How can we filter the messages from the POS system to permit only IP and SNA (3270 emulation) messages to be sent and received between locations? We do not want NetBIOS messages to exit from the store.
Two solutions to the IP and SNA WAN need are listed below. This LAN-WAN support is provided by the routers, and the only 4690 tuning required would be to review 4690 SNA timers for WAN delay implications. Search the Knowledgebase for "4690 OS Logical File Names" for information regarding LAN/SNA timers.1) Route IP and bridge SNA
Setting up a router to route IP and bridge SNA is feasible and is a normal capability of routers. It is recommended that other non-routable protocols be prevented from traversing the WAN, so filters might have to be put in place to Deny RPL, NetBIOS and TCC frames. If you are using SAP filters, the associated SAPs are:
0xF0 for NetBIOS Flows
0xE8 for TCC flows
0xF8 and 0xFC for RPL flowsConsult your router vendor documentation about how to set up this environment.2) Route IP and use Encapsulation Technique for SNA
Many router vendors provide an encapsulation technique to pass SNA data over the IP network. In IBM router products (2210, 2212, and 2216) two strategies are available:
Data Link Switch
Enterprise Extender Consult your router documentation for details about encapsulation techniques.
