BLE IPSP sample doesn't work on raspberry pi 4 with nrf52840_mdk board

[hguomin8]

Describe the bug
Follow the steps in the IPSP sample document to test BLE IPSP connection between RPI4 and nrf52840_mdk board, while I can ping nrf52840_mdk successfully with scoped IPv6 address, but can't ping with static ipv6 address, also can't connect to the board using telnet, please check the screen shot below.

To Reproduce
Steps to reproduce the behavior:

1. cd zephyr\samples\bluetooth\ipsp
2. west build -b nrf52840_mdk . -DCONF_FILE="prj_dbg.conf"
3. west flash
4. See error in below screen shot

Expected behavior
Can ping and telnet via static ipv6 address

Impact
Can not make any progress without this ipsp feature...

Logs and console output

1. Steps and ouputs on RPI 4
   

2. net shell logs on nrf52840_board
   

Environment (please complete the following information):

• OS: (Raspberry pi OS(buster, kernel 5.4.51-v7l+))
• Zephyr branch: master

Additional context

1. In below environment, it works

• OS: Raspberry pi OS(buster, kernel 4.19.97-v7+)
• Zephry branch: v2.3.0

2. In below environment, can ping with static ipv6 address, but can not connect via telnet

• OS: Raspberry pi OS(buster, kernel 5.4.51-v7l+)
• Zephyr branch: v2.3.0

[Vudentz]

We will probably need some HCI logs, but it does looks like this is a Linux problem rather than Zephyr.

[hguomin8]

Hmm...this issue can be reproduced easily, look forward you guys can help to fix it, I am not specialize in kernel development

[carlescufi]

@hguomin8 could you please report this to the Linux BlueZ mailing list, since this looks like a BlueZ issue? I will close this issue but feel free to reopen it if you find out this to be a Zephyr issue instead.