Secure remote access to historical data

A system for providing access to historical data over a real-time tunnel, comprising:

• an operational technology (OT) network an operational technology (OT) network including one or more processors configured to:
• obtain from a data source, by a first connector, real-time data, wherein the first connector includes a first tunneller, a first history-writer and a first history-tunneller;
• interleave the real-time data and historical data over a first tunnel connection, a first firewall and a second firewall in conjunction with a de-militarized zone (DMZ) and an information technology (IT) network by (a) performing pull replication of the historical data, (b) daisy chaining the historical data, or (c) a combination of (a) and (b);
• and
• write the real time data to the first tunneller to store and forward the real time data by the first tunneller.

A non-transitory computer-readable medium having stored thereon one or more sequences of instructions, which when executed by one or more hardware processors, cause the one or more hardware processors to provide access to historical data over a real-time tunnel in an architecture including an operational technology (OT) network, a de-militarized zone (DMZ) and an information technology (IT) network by:

• obtaining from a data source, by a first connector, real-time data, wherein the first connector includes a first tunneller, a first history-writer and a first history-tunneller;
• interleaving the real-time data and historical data over a first tunnel connection, a first firewall and a second firewall by (a) performing pull replication of the historical data, (b) daisy chaining the historical data, or (c) a combination of (a) and (b);
• and
• writing the real time data to the first tunneller to store and forward the real time data by the first tunneller.