We are debugging an issue like below link,
We need set MTU=500 (original default value is 1500) for LAN output packet normlly work or it cannot send any output packet.
It seems that the issue of above linked still exist in the kernel.(Linux YOCTO version 4.9.88-imx_4.9.88_2.0.0_ga+g159b147)
Do you have any updated about the issue?