Linux

Building a soft router on Ubuntu

The original workstation was changed to Ubuntu 24.04, and I usually need to connect to the workstation directly through my Windows office laptop. At first, I connected to the wireless network, but the upload and download data was too slow. Later, I used a wired network card to bridge, but sometimes the data was not transmitted through the wired network card but through the wireless network card. Disabling the laptop’s wireless network card and being unable to go online for work is not a good solution.

2025-07-18

3 minutes to read

Andrew Moa

Solve the “Authorization required, but no authorization protocol specified” error message of OpenMPI

Recently, when submitting calculations with OpenFOAM and SU2, the error message “Authorization required, but no authorization protocol specified” repeatedly appeared. Although the calculation was eventually completed by ignoring it, the constant error message made me feel uneasy.

I suspected that it was a problem with OpenMPI, and verified it with the following command:

mpirun -np 2 hostname

Sure enough, an error message appeared:

2025-04-16

One minute to read

Andrew Moa

OpenFOAM compiles and installs cfmesh and ccm tools

1. Compile cfmesh

The early compiled and installed OpenFOAM version of com, with the version number v2412, and there is no source code with cfmesh. According to the official documentation, you need to manually download the source code file of cfmesh:

cd $WM_PROJECT_DIR
git submodule update --init --recursive plugins/cfmesh

The following error occurs:

fatal: fatal: not a git repository (or any of the parent directories): .git

Okay, let’s try another approach. Download the source code directly through git to the specified folder, folder and URL path to view it .gitmodules document:

2025-03-27

2 minutes to read

Andrew Moa