# Gateway configuration with multiple network interfaces NICs

**URL:** <https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962>\
**Category:** Ignition\
**Created:** [July 22, 2016, 3:57pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962 "2016-07-22T15:57:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![heybales](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/heybales/32/3358_2.png) [@heybales](https://forum.inductiveautomation.com/u/heybales)\
**Post date:** [July 22, 2016, 3:57pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962/1 "2016-07-22T15:57:38Z")

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How do I configure OPC UA to use a specific NIC card when connecting to PLCs?

My system has 3 NICs and Ignition appears to be only attempting to connect using the default NIC.

I’m using Ignition 7.8.3 and Ubuntu 16.04.

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [July 22, 2016, 4:02pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962/2 "2016-07-22T16:02:55Z")

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You don’t need to specify a NIC when making an outbound connection, like to a PLC. If you can ping it, you will be able to connect, assuming nothing else is wrong.

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**Author:** ![heybales](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/heybales/32/3358_2.png) [@heybales](https://forum.inductiveautomation.com/u/heybales)\
**Post date:** [July 22, 2016, 5:13pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962/3 "2016-07-22T17:13:49Z")

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Hmm. I can ping it. So maybe something else is wrong.

Currently, I have two modbus TCP devices connected to this server. One is connected via the default NIC 1 (address 192.168.1.43), and the other is connected via NIC 3. I can ping both devices. But the gateway does not connect to the device on NIC 3 ( address 10.1.1.10).

The error is something like No route detected. (sorry, not in front of the system at this moment)

Eventually all devices will connect via NIC 3.

I got feedback from support instructing me to change the endpoint address of the OPC UA server. I thought that the endpoint address was only for discovery by OPC clients. Am I right, or does the endpoint also control connection to OPC devices?

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [July 22, 2016, 5:36pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962/4 "2016-07-22T17:36:37Z")

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Support did not understand what you were asking. You’re correct - the endpoint setting controls which IP the server tries to bind to, which would effect incoming UA client connections.

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<div class="post-metadata">

**Author:** ![heybales](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/heybales/32/3358_2.png) [@heybales](https://forum.inductiveautomation.com/u/heybales)\
**Post date:** [July 22, 2016, 6:50pm UTC](https://forum.inductiveautomation.com/t/gateway-configuration-with-multiple-network-interfaces-nics/11962/5 "2016-07-22T18:50:29Z")

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my current thinking is that the OPC UA server is not aware of NIC 3. Perhaps there is some configuration required at the linux level. Host table? I’m not sure.

Error message attached.