Configure Protocol Switch software
Digi TransPort User Guide
583
NUA to Interface Mappings
This page contains a table to enter a series of X.25 NUA or NUI values along with IP addresses/
Ports to which they should be mapped, if you need to override the default settings in the
Configuration > Network > Legacy Protocols > X.25 > NUA/NUI Interface Mappings
page.
If, in the
Protocol Switch
configuration, you had configured the router to switch from
LABP 0
to
TCP
, the
IP Address
and
Port
values would normally be determined from the
XOT Remote IP
address
and
IP stream port
parameters. However, having set up the NUA/NUI to IP addresses
table as shown in the example above, if an X.25 call with NUA of value
222
is received on
LAPB 0
,
it is switched onto a TCP socket using IP address
1.2.3.4
on port
45
instead of the settings
configured on the
Configuration > Network > Legacy Protocols > X.25 > NUA/NUI Interface
Mappings
page.
Similarly, NUIs can also be matched. In this example, a call with NUI of value
test
is switched onto
a TCP socket using IP address
100.100.100.1
on port
678
.
All three comparison fields, NUA, NUI and Call Data can use the wildcard matching characters
?
and
*
. In the example shown above, when an X.25 call is received with either the NUA having
1234
followed by any 2 digits or a call being received with call user data with any 4 characters
followed by
aa
, the call is switched to a TCP socket on address
100.100.100.52
on port
4001
.
When a connection has been successfully established and data is being switched from the X.25
call to the socket and from the socket to the X.25 connection, it can be terminated by either the
socket closing or the X.25 call clearing.
If the connection terminates because of an incoming X25
CALL CLEAR
packet, the switch
terminates the socket connection. If the connection terminates because the socket is closed, the
switch clears the X.25 call by transmitting a
CALL CLEAR
packet.
