Strict Connection Control Parameters (Section E) - Emerson PACSystems RX3i User Manual

User Manual
GFK-2911E
However, bit 12 in Option Parameter Word 17 can be used to make the buffer circular. The
Circular buffer, in contrast, will start discarding the oldest event when the buffer for an
object becomes full. When reporting out, the first-reported event will be the oldest event
captured, with the others following in reverse chronological order.

Strict Connection Control Parameters (Section e)

The DNP3 Outstation application code can enforce strict acceptance of connections to the
EDS001 by DNP3 master stations. There are two general parameters which govern this
feature and corresponding parameters for setting the incoming connection masks. This
functionality is also referred to as white listing.
The EDS001 module allows the establishment of a white list of allowed connections, both
TCP/IP and LLA Master Station addresses. The parameters for this feature are such that they
can be enabled independently. This firmware allows LLA whitelisting to be enabled without
IP whitelisting, with constraints. However, LLA white listing is to be used with TCP/IP white
listing, not by itself. The constraint being that module only makes an SOE connection
(Port+1).
Note:
General Parameters
Parameters mComreq_Setup[67] and mComreq_Setup[68] configure the DNP3 Outstation
to operate in a restrictive connection mode. Whenever parameters mComreq_Setup[67]
and mComreq_Setup[68] are set to zero (0), the DNP3 Outstation will accept connections
from any master station without regard to source address.
To configure the ability of the DNP3 Outstation to restrict those masters permitted to
connect to it, the above two parameters are being used to enable checking of the source
TCP/IP (IPV4) address via mComreq_Setup[67] or
the source Lower-Level Address (LLA) address via mComreq_Setup[68], as described in the
following tables.
Strict TCP/IP Address Matching
Use parameter mComreq_Setup[67] to enable restrictive TCP/IP addressing features.
Parameters mComreq_Setup[69] through mComreq_Setup[100] are then used in groups
of four (4) to set the IPV4 addresses of the master stations that are allowed to connect to
the Outstation. Reference the table below for address assignments. Default values are
listed; set values for these parameters as required by the application.
Parameter
mComreq_Setup[67]
mComreq_Setup[69]
mComreq_Setup[70]
Configuration of DNP3 outstation Parameters
When SOE, Strict IP address and LLA matching are enabled, the 1st configured IP address
and LLA are dedicated to SOE port (Port+1) and 2nd to 8th IP address dedicated to Non-SOE
port (port).
Value
0 / non- zero
10
0
Description
Strict TCP/IP Address Matching for Master Stations:
Value: 0 – disable, non-zero – enable
IP address octet 1 – Master Station 1
IP address octet 2
Chapter 6
Sep 2019
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