. "ECN" . . "Internet Protocol version 4" . . . "192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24" . . "Time To Live" . "Protocol" . "source IP address" . . . . . . "fragmentation" . . . . . "IPv4 datagram" . . . . . . "Header Checksum" . . . . . "IP" . . . . . . "IPv4 \u00A7 Special-use addresses" . "packet structure" . . "Source IP Address" . . "Fragment Offset" . . "IPv4" . . "Options" . . . . . . . . . . . . . . . "IPv4 address" . . . . "Version 4" . . "Destination IP Address" . . . "IPv4 packet header" . . . . "Internet Protocol Version 4" . . . . . . . . . "special-use addresses" . . "router ID" . "IPv4 \u00A7 Addressing" . . . . . "IPv4 header" . . . . "IPv4#Header" . "version 4" . . "IP packet header" . "IP header" . . "Identification" . . "DSCP" . "IPv4#Addressing" . . "Total Length" . "TCP or UDP" . . . . "fragmentation re-assembly" . "Flags" . . . . . . "IPv4" . . . . . . "destination IP address" . "private Internet address space" . "Version" . . . . . . . "IPv4#Packet structure" . . . . . . . "IP space" . . "IHL" . . "''Don't Fragment'' bit" . .