TDA4VM: Vision_apps' ethfw demo running error!

Hi,expert:
I'm using ti_rtos sdk 7.02 vision_apps.
I 'v met some problems when trying to run the ethfw demo program in vision_apps , can you help me?

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/07_02_00_06/exports/docs/vision_apps/docs/user_guide/ETHFW_DEMOS.html#autotoc_md239

I followed the tutorial and successfully ran the DHCP service and plex server on PC1, and connected the port 2 of the GESI card with a cable.
At the same time, another ubuntu computer is connected to port3 with a cable.

After starting j721e, A72 and mcu2_0 successfully obtained the ip address, but PC2 could not automatically obtain the ip, so I manually specified the ip address of pc2 to be in the same network segment. But pc2 cannot ping A72 or mcu2_0, and cannot access the plex service.

in my setting 

pc1:192.168.10.1

A72:192.168.10.136

mcu2_0:192.168.10.135

pc2: can not get the ip addr then i set the ip to 192.168.10.138

result

pc 1:   ping  192.168.10.136 ..... ok

pc 1:   ping  192.168.10.135 ..... ok

pc1:   ping 192.168.10.138 failed

here is the log:

cpsw9.txt