active connections
ss -tu (-t tcp, -u udp)
where the server is listening
ss -tunpl (-n do not resolve DNS, -p PID)
scan local network
nmap -n 192.168.1.0/24
debug by slowing down
tc qdisc add dev <interface> root netem delay 500ms
bring back
tc qdisc del dev <interface> root netem
show current settings
tc qdisc show
tc class show dev DEV
tc filter show dev DEV
capture packets
tcpdump -i <interface>