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

Abaqus and CFX solvers cannot be run in Linux mounts Windows shared folders

Recently, a problem was discovered that Abaqus and CFX cannot perform calculations on Windows shared folders mounted on Linux. Linux is deployed on a virtual machine. Although there will be no error when starting the calculation program on the local path of the virtual machine, it will cause the virtual disk to occupy more space and have a certain impact on the read and write efficiency.

1. SMB version problem

1.1 SMBv3

When using cifs to mount a shared folder before, I did not pay close attention to the version of the SMB protocol¹. The following command line does not specify the protocol version:

2025-04-15

4 minutes to read

Andrew Moa