ESP32S3 Ethernet connection with IPV6 address

[fanmen1]

Hi, I'm trying to include a IPV6 feature for MODBUS TCP/IP stack which works flawlessly with IPV4 but once I assign IPV6 address and also change the TCP/IP mode to IPV6, there is no connection establishment. Can someone point me to example initialisation for ethernet IPV6, cause I can't find one example for ethernet.

The ethernet is initialised properly and I'm able ping my device from the command prompt. However, it does not accept the modbus TCP/IP connection. I'm using ESP-IDF v5.1.5 in visual studio code.