Following
information for reference only, please click product name
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How
Does SNA over TCP/IP Work?
SNA over TCP/IP uses protocols that bypass the lower transport
layers of the SNA architecture. This process is transparent
to the SNA application program. Using a supported API, an application
program passes data to the presentation services of Personal
Communications. This data, in turn, is passed through the SNA
architectural layers and presented to SNA over TCP/IP at the
data link control level. When Personal Communications initiates
a session for an application program, SNA over TCP/IP translates
the SNA routing information (network-qualified name) into IP
routing information (IP address) and uses the IP address to
create a TCP connection to the appropriate system.
Below picture illustrates how an SNA over TCP/IP access node
enables SNA application programs to communicate over IP networks.
The configuration information you define enables SNA over
TCP/IP to determine:
• Whether to route the data using SNA or to route the data
using IP
• The IP address associated with the network-qualified LU
name
SNA over TCP/IP uses both stream (TCP) and datagram (UDP)
sockets that are bound to the well-known port (397).
