# Siemens PLC behind router

**URL:** <https://forum.inductiveautomation.com/t/siemens-plc-behind-router/98931>\
**Category:** Ignition\
**Tags:** siemens, ignition81\
**Created:** [November 21, 2024, 1:14pm UTC](https://forum.inductiveautomation.com/t/siemens-plc-behind-router/98931 "2024-11-21T13:14:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![David\_Kranjc](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/david_kranjc/32/43007_2.png) [@David\_Kranjc](https://forum.inductiveautomation.com/u/David_Kranjc)\
**Post date:** [November 21, 2024, 1:14pm UTC](https://forum.inductiveautomation.com/t/siemens-plc-behind-router/98931/1 "2024-11-21T13:14:30Z")

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Hello,  
in our production facility, we have Siemens PLC-s connected to a Siemens Router S615. Is there a way for Ignition to connect to the PLCs through the router? If so, I would kindly ask for a description of the solution.

Thank you very much,  
David.

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**Author:** ![ryan.white](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ryan.white/32/73193_2.png) [@ryan.white](https://forum.inductiveautomation.com/u/ryan.white)\
**Post date:** [November 21, 2024, 7:47pm UTC](https://forum.inductiveautomation.com/t/siemens-plc-behind-router/98931/2 "2024-11-21T19:47:07Z")

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Do you have it behaving as a NAT router? If so, you may need to configure the PLC to have an IP on the WAN side of the router. This would be configured on the router itself. You would then point your Ignition driver connection to that WAN side address.

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**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\
**Post date:** [November 21, 2024, 9:27pm UTC](https://forum.inductiveautomation.com/t/siemens-plc-behind-router/98931/3 "2024-11-21T21:27:04Z")

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And you **must configure the PLC's gateway setting** to point to the router's IP address. Otherwise, even if the data request comes into the PLC, it has no clue how to send a response out to the wider network.