Check network bandwidth

Measure TCP throughput with 4 parallel streams for 10 seconds

iperf3 -c <server_ip> -t 10 -P 4

More linux commands

Monitor network traffic live

iftop -i eth0 -n

Real-time bandwidth per connection on an interface
Show kernel version

uname -r && uname -a

Kernel release string and full system info
Kernel ring buffer

dmesg -T --level=err,warn | tail -50

Last 50 kernel errors/warnings with human-readable timestamps
List loaded kernel modules

lsmod | sort

All currently loaded kernel modules
Load a kernel module

modprobe <module> && lsmod | grep <module>

Load a module with dependencies and verify