[suprjami]

Packagecloud have a great article series which goes into much more detail and with code study. If you really want to learn the network send and receive, these are the articles to read:

https://blog.packagecloud.io/monitoring-tuning-linux-network...

https://blog.packagecloud.io/monitoring-tuning-linux-network...

https://packagecloud.io/blog/illustrated-guide-monitoring-tu...