Welcome to KAZULOG!/Network Articles/IPv4 Articles/IPv4 ArticlesIPv4IPv4 Packet Header StructureIPv4 AddressesIPv4 Subnet Mask CalculatorDHCP (Dynamic Host Configuration Protocol)DHCP Relay AgentARP (Address Resolution Protocol)ICMP (Internet Control Message Protocol)ICMP Echo Request/Reply (ping)ICMP Time Exceeded (traceroute)ICMP Destination Unreachable