# FreeRTOS+TCP network interface port layer requirement!

**URL:** <https://forums.freertos.org/t/freertos-tcp-network-interface-port-layer-requirement/6148>\
**Category:** Kernel\
**Created:** [August 31, 2016, 4:36pm UTC](https://forums.freertos.org/t/freertos-tcp-network-interface-port-layer-requirement/6148 "2016-08-31T16:36:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [August 31, 2016, 4:36pm UTC](https://forums.freertos.org/t/freertos-tcp-network-interface-port-layer-requirement/6148/1 "2016-08-31T16:36:26Z")

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**[pgsaslam](https://sourceforge.net/u/pgsaslam/)** wrote on [Wednesday, August 31, 2016](https://sourceforge.net/p/freertos/discussion/382005/thread/e690a736/#6444):

We use Xilinx Zynq ZC702 platform with FreeRTOS+TCP for our applications. I have a requirement of upgrading the “Network Interface Port Layer” as defined in

to support two interfaces, one whereby packets are sent via ethernet interface of Xilinx Zynq ZC702 and other via our custom applications.

Is this possible by just modifying the Network interface port layer or other modifications are also required? Kindly clarify?

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**Author:** ![rtel](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/rtel/32/31_2.png) [@rtel](https://forums.freertos.org/u/rtel)\
**Post date:** [August 31, 2016, 8:04pm UTC](https://forums.freertos.org/t/freertos-tcp-network-interface-port-layer-requirement/6148/2 "2016-08-31T20:04:15Z")

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**[rtel](https://sourceforge.net/u/rtel/)** wrote on [Wednesday, August 31, 2016](https://sourceforge.net/p/freertos/discussion/382005/thread/e690a736/#6444/f74d):

Without a deeper understanding of what it is you are trying to do it is  
difficult to say for sure. We do however have an experimental version  
of FreeRTOS+TCP that supports multiple interfaces (with different IP  
address, MAC addresses, etc.).