• https://learning.oreilly.com/library/view/mastering-linux-network/9781784399597/ – Mastering Linux Network Administration (PacktPub) !!!!!
• https://learning.oreilly.com/library/view/mastering-linux-network/9781784399597/ch02s04.html !!!!!
• https://learning.oreilly.com/library/view/linux-networking-cookbook/9780596102487/ – O’Reilly
• https://learning.oreilly.com/library/view/linux-network-administrators/0596005482/ – O’Reilly
• https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/ – great article showing how to do modern Linux networking on the command line
• https://en.wikipedia.org/wiki/iproute2 – includes a rather compact but useful (mapping) table
• https://wiki.linuxfoundation.org/networking/iproute2
• https://wiki.linuxfoundation.org/networking/iproute2_examples
• https://lartc.org/howto/
• http://www.policyrouting.org/iproute2.doc.html
• https://www.lisenet.com/2013/finding-open-ports-and-listening-services-on-linux/
• https://www.lisenet.com/tag/netstat/
• https://linuxize.com/post/check-listening-ports-linux/ – how to check for listening ports in Linux (“ports in use”)

package / suite net-tools (including netstat) replaced (in the early 201x) by package / suite iproute2.