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====== net-tools (deprecated) vs iproute2 ======
* 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 – understanding the net-tools and iproute2 suites !!!!!
* 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://en.wikipedia.org/wiki/iproute2 – includes a rather compact but useful (mapping) table
* https://wiki.linuxfoundation.org/networking/iproute2 – a collection of utilities for controlling TCP / IP networking and traffic control in Linux
* https://wiki.linuxfoundation.org/networking/iproute2_examples – IPROUTE2 Utility Suite Howto
* https://linuxize.com/post/check-listening-ports-linux/ – how to check for listening ports in Linux ("ports in use")
* https://www.lisenet.com/2013/finding-open-ports-and-listening-services-on-linux/ – Finding Open Ports and Listening Services on Linux: nmap, '''netstat''', '''lsof''' and '''ss'''
* https://www.lisenet.com/tag/netstat/
* 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
* http://www.policyrouting.org/iproute2.doc.html
* https://lartc.org/howto/ – Linux Advanced Routing & Traffic Control HOWTO

How to get a list of all listening ports:
<pre>
$ sudo yum install …
$ sudo ss -tunlp
</pre>