NL200/201 Network Link Interface
22
Configuration B
In Configuration B, the NL200/201 decrypts TLS traffic and forwards the
unencrypted TCP traffic to the datalogger back out on the Ethernet port. The
user must specify an IP address and TCP port number for the forwarding TCP
connection.
To configure the NL200/201 TLS Proxy Server to communicate with a
datalogger attached to the CS I/O port or with a datalogger over an Ethernet
connection, open
DevConfig
and configure the following settings.
Settings Editor | TLS Proxy Server Tab
x
Set the
TLS Proxy Server
setting to
enable
.
x
Set the
TLS Proxy Server Port Number
. This is the TCP port number
on which the proxy server will listen for incoming connections. The TLS
Client also needs to be set to communicate on this port number. When
TLS communications are received on this port number, the NL200/201
will decrypt the data and attempt to open a TCP connection to the
datalogger and forward the unencrypted data. In HTTPS communications,
web browsers use port 443. The NL200/201 will always listen on port 443
regardless of the value of this setting. Therefore, if HTTPS
communications are desired, it is unnecessary to configure this setting.
x
Set the
TLS Proxy Forward Physical Port
to
CS I/O Port
for
Configuration A or to
Ethernet Port
for Configuration B.
x
For Configuration A, leave the
TLS Proxy Forward IP Address
set to
0.0.0.0. For Configuration B, enter the datalogger’s IP address in the
TLS
Proxy Forward IP Address
setting. This address must be configured in
the datalogger. It must be a unique, static IP address on the same subnet as
the NL200/201 IP address. For example, if the NL200/201 IP address is
192.168.5.1 with subnet 255.255.255.0, a valid IP address for the
datalogger would be 192.168.5.2 provided there are no other devices on
the subnet with that address.
x
Set the
TLS Proxy Forward Port Number
. This is the TCP port number
that the proxy server will use when it opens a TCP connection to the
datalogger to forward unencrypted data. The datalogger’s TCP server port
must be set to communicate on this port number. The default value for the
datalogger’s PakBus/TCP server is 6785, so this setting can likely be left
at the default. The datalogger listens for HTTP traffic on port 80. The
NL200/201 will always forward TLS traffic received on port 443(HTTPS)
to port 80(HTTP) regardless of this setting. Therefore, if HTTPS
communications are desired, it is unnecessary to configure this setting.
x
It is recommended to leave the
TLS Proxy Timeout
set to
90
seconds
although it can be changed if desired. This will determine how fast the
NL200/201 proxy server and client connections will timeout if no activity
is detected.
To configure the datalogger for Configuration A, connect to the datalogger
using
DevConfig
and select the CS I/O IP tab. Set the
CS I/O Interface IP
Address
to a static IP address. Use the datalogger’s CS I/O Interface that
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