Show iptables rules

All filter table rules with packet counters and line numbers

iptables -L -n -v --line-numbers

More linux commands

Show nftables ruleset

nft list ruleset

Full nftables ruleset in human-readable form
Check network bandwidth

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

Measure TCP throughput with 4 parallel streams for 10 seconds
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