Fragment Offset: this 13 bit field specifies the position of the fragment in the original fragmented IP packet. Time to Live: Everytime an IP packet passes through a router, the time to live field is decremented by 1. Once it hits 0 the router will drop the packet and sends an ICMP time exceeded message to the sender. The time to live field has

The IP packet structure. Definition at line 80 of file ip.h. Field Documentation. uint16_t ip::ip_chk IP header checksum. Definition at line 104 of file ip.h. As the packet travels through the TCP/IP protocol stack, the protocols at each layer either add or remove fields from the basic header. When a protocol on the sending host adds data to the packet header, the process is called data encapsulation. Moreover, each layer has a different term for the altered packet, as shown in the following figure. iph.ip_len = (unsigned short int)0x103C; The others you were actually assigning as characters. I'm not sure if that was you intention. So in iph.ip_v='\x4', the '\x4' actually represents a character which is then assigned to the ip_v member (truncated to 4 bits). But you could have just written iph.ip_v=0x04. TCPIP Packet Format. This tutorial covers everything one like to know about networking basics including circuit switching vs packet switching, TCP/IP protocol fields, ARP/RARP protocol fields, what is IP address ,what is MAC address, networking devices which include hub, switch, bridge, router, gateway and firewall.

User Datagram Protocol - Wikipedia

The TCP/IP Guide - DHCP Message Format Server IP Address: The meaning of this field is slightly changed in DHCP. In BOOTP, it is the IP address of the BOOTP server sending a BOOTREPLY message. In DHCP, it is the address of the server that the client should use for the next step in the bootstrap process, which may or …

TCPIP Packet Format. This tutorial covers everything one like to know about networking basics including circuit switching vs packet switching, TCP/IP protocol fields, ARP/RARP protocol fields, what is IP address ,what is MAC address, networking devices which …

Server IP Address: The meaning of this field is slightly changed in DHCP. In BOOTP, it is the IP address of the BOOTP server sending a BOOTREPLY message. In DHCP, it is the address of the server that the client should use for the next step in the bootstrap process, which may or … Difference Between Frame and Packet (with Comparison Chart Aug 18, 2017