when I tried to ping n2 from n1's terminal, it failed to connect

[PRCZHY]

My operating system is Ubuntu 22.04, and my CORE version is 9.2.0.

I followed the website tutorial, opened the file from Tutorial 1, and ran it. However, when I tried to ping n2 from n1's terminal, it failed to connect. Here is a screenshot of the issue:

Additionally, I encountered an error when starting the daemon:

*"TypeError: Descriptors cannot be created directly.

If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc >= 3.19.0.

If you cannot immediately regenerate your protos, some other possible workarounds are:

Downgrade the protobuf package to 3.20.x or lower.
Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower)."*
I temporarily resolved this by running:

export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python

[bharnden]

I am assuming the protobuf error is related to EMANE, without seeing the complete error its hard to say. I also am not sure how you installed everything to get here.

Not being able to ping across nodes is usually a symptom of having Docker installed, which is blocking traffic.

https://coreemu.github.io/core/install.html#resolving-docker-issues

[PRCZHY]

Thanks for your help.
Following up on the previous issue (which has been resolved, and hosts can now ping each other successfully), I encountered a new error when using the WLAN interface.
Problem description:
I did not modify any WLAN configurations.
Even when directly running the example from the official tutorial (https://coreemu.github.io/core/tutorials/tutorial2.html#files), the same error occurs.
Error：
Exception calling application: command(vcmd -c /tmp/pycore.2/n2 -- tc qdisc replace dev eth0 root handle 10: netem rate 54000.0kbit limit 45 delay 5000us 0us 25%), status(2):
stdout:
stderr: Error: Specified qdisc kind is unknown.

[bharnden]

Seems like you are missing the netem kernel module. Assuming you use Ubuntu desktop, I have not seen that before.

Otherwise it claims you would need to install the iproute2 package.