Networking

mac vendor 

https://standards-oui.ieee.org/

arp
ip scan
port scan
mdns avahi dns-sd
dhcp leases
webserver server/powered-by
ssh banner

ifupdown-ng
netcli
netplan
iptables / nftables netfilter
tc

https://askubuntu.com/questions/1476599/how-can-i-limit-the-outbound-traffic/1477145#1477145

1. periodically check the netstat counters
2. check ip addr counters, to split out by dev and protocol
3. optionally also check iptables for specific network traffic
4. check against limits and adjust speed
   /proc/net/dev

ip -j --oneline addr
ip -j -s addr
ip -s addr
ip -j --oneline addr | jq '.[1]."addr_info"[] | .dev'

https://lartc.org/howto/

https://lartc.org/howto/lartc.cookbook.fullnat.intro.html

tc queueing disciplines

tag traffix, qos

http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm

https://serverfault.com/questions/70042/linux-traffic-shaping-using-tc

https://serverfault.com/questions/154451/throttle-bandwidth-via-iptables

iptables with "--limit"