# Using localhost on OPC UA endpoint configuration Node

**URL:** <https://discourse.nodered.org/t/using-localhost-on-opc-ua-endpoint-configuration-node/76389>\
**Category:** General\
**Tags:** opcua\
**Created:** [10 March 2023 13:30 UTC](https://discourse.nodered.org/t/using-localhost-on-opc-ua-endpoint-configuration-node/76389 "2023-03-10T13:30:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Manikandan](https://avatars.discourse-cdn.com/v4/letter/m/3da27b/32.png) [@Manikandan](https://discourse.nodered.org/u/Manikandan)\
**Post date:** [10 March 2023 13:30 UTC](https://discourse.nodered.org/t/using-localhost-on-opc-ua-endpoint-configuration-node/76389/1 "2023-03-10T13:30:51Z")

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Hi,

I am new to Node-Red, In my Project I have a Codesys and Node-Red and both of them running in single Raspberry Pi OS.  
I am having a OPC-UA as a communication between these two application and Codesys acts as a server and Node-Red is one of the Client.  
I am sharing nearly 1000 variables between them, On the OPUA Endpoint configuration node ,

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/2/222b9bda0e358b08594541575ab53b463b951394.png)

1. Is it ok to use opc.tcp://localhost:4840 instead of opc.tcp://192.168.1.175:4840 ?

2. While doing this., Will be there be a benefit of reducing the network traffic on the 192.x.x.x network ?

3. While doing this , Will there be a chance of increasing of Raspberry Pi OS CPU Load ?

Your input highly appreciated.

_Best Regards,_  
Mani

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [9 May 2023 13:31 UTC](https://discourse.nodered.org/t/using-localhost-on-opc-ua-endpoint-configuration-node/76389/2 "2023-05-09T13:31:50Z")

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