Linux
https://ubuntu.com/tutorials/command-line-for-beginners#1-overview
Ethernet
https://www.rfwireless-world.com/Tutorials/Ethernet-tutorial.html
Private vs Public IP
VMWare Networking
https://masteringvmware.com/vmware-workstation-networking-overview/
IP protocol
https://www.cloudflare.com/en-ca/learning/network-layer/internet-protocol/
https://www.omnisecu.com/tcpip/ipv4-protocol-and-ipv4-header.php
https://www.ibm.com/docs/en/aix/7.2?topic=protocol-tcpip-protocols
https://www.techtarget.com/searchunifiedcommunications/definition/Internet-Protocol
https://www.tutorialspoint.com/ipv6/ipv6_headers.htm
TCP
https://networklessons.com/cisco/ccie-routing-switching-written/tcp-header
https://danielmiessler.com/study/tcpdump/
UDP
https://www.geeksforgeeks.org/user-datagram-protocol-udp/
https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/introduction-to-tcp-and-udp
https://dzone.com/articles/tcpdump-learning-how-read-udp
ICMP
https://www.howtouselinux.com/post/tcpdump-filter-icmpv6-packets