The IPv4 Header Fields
00:00 Introduction
00:28 Version
00:40 IHL
01:30 DS & ECN
02:24 Total Length
02:56 Identification | Flags | Fragment Offset
04:20 TTL
05:06 Protocol
05:34 Header Checksum
06:08 Source & Destination IP
06:30 Options
IANA protocol numbers https://www.iana.org/assignments/protocol-numbers
ipv4
