Diagnosing X.25 NPSI problems
This topic discusses how to diagnose X.25 NPSI problems
and includes the following subtopics:
The X.25 NPSI server uses an X.25 network or point-to-point X.25 line to transfer TCP/IP traffic. The X.25 NPSI server is a VTAM® application running as a started task. Either the NPSI Generalized Access to X.25 Transport Extension (GATE) or Dedicated Access to X.25 Transport Extension (DATE) can be used. GATE is recommended because it allows NPSI to handle more details of error recovery and allows an X.25 physical link to be shared with other functions.
Details of the GATE and DATE programming interfaces are in X.25 NPSI Host Programming, and further diagnostic information is in X.25 NPSI Diagnosis, Customization, and Tuning.
Specifications for carriage of IP traffic on X.25 networks
can be found in:
- RFC 877
- A Standard for the Transmission of IP Datagrams Over Public Data Networks
- X25.DOC
- Old DDN X.25 specifications from BBN (available by anonymous FTP from nic.ddn.mil in directory netinfo)
- RFC 1236
- IP to X.121 Address Mapping for DDN
- RFC 1356
- Multiprotocol Interconnect on X.25 and ISDN in the Packet Mode
Figure 1 shows the X.25 NPSI environment.
Figure 1. X.25 NPSI environment