====== LAN topology recommendations ======

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^  C LAN  | Control system local area network  |
^  B LAN  | Facility local area network        |


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^  ID  ^  Description                                                                                          ^  "C" LAN settings                ^  "B" LAN settings                          ^
^  1   | IOT Linker                                                                                            | IP: 192.168.10.1\\ **LAN port**  | IP: from B LAN DHCP server\\ **WAN port**  |
^  2   | Control system LAN Ethernet switch                                                                    | -                                | -                                          |
^  3   | Controllers                                                                                           | IP: 192.168.10.20 - .99          | -                                          |
^  4   | Various control system devices with LAN connection (SCADA work-stations, operator touch panels, ...)  | :::                              | -                                          |
^  5   | Facility LAN Ethernet router / switch                                                                 | -                                | -                                          |
^  6   | Facility LAN Ethernet devices (computers, printers,...)                                               | -                                | -                                          |

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^  General "C" LAN settings                                    ||
| DHCP Server                | Implemented in IOT Linker        |
| :::                        | 192.168.10.100 - 192.168.10.150  |
| Subnet Mask                | 255.255.255.0                    |
| Gateway                    | 192.168.10.1                     |
| DNS 1                      | 208.67.222.222                   |
| DNS 2                      | 208.67.220.220                   |
| DNS 3                      | 1.1.1.1                          |
| DNS 4                      | 1.0.0.1                          |


===== Alternative Topology =====

{{:wiki:50_common:lan_b.png?nolink|}}

**The control system is connected to the business network. All protections are provided by the business network administrator!**

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^  B LAN  | Facility local area network  |


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^  ID  ^  Description                                                                                          ^  "B" LAN settings                           ^
^  1   | IOT Linker                                                                                            | IP: from B LAN DHCP server \\ **WAN port**  |
^  2   | Facility LAN Ethernet switch                                                                          | -                                           |
^  3   | Controllers                                                                                           | IP: from B LAN DHCP server                  |
^  4   | Various control system devices with LAN connection (SCADA work-stations, operator touch panels, ...)  | :::                                         |
^  5   | Facility LAN Ethernet router / switch                                                                 | -                                           |
^  6   | Facility LAN Ethernet devices (computers, printers,...)                                               | -                                           |