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An IP packet is the smallest message entity exchanged via the Internet Protocol across an IP network. IP packets consist of a header for addressing and routing, and a payload for user data. The header contains information about IP version, source IP address, destination IP address, time-to-live, etc. The payload of an IP packet is typically a ...
This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.
This field is the length of the encapsulated IP packet (including Outer IP Header, Inner IP Header, IP Payload). Identification: 16 bits This field is used to identify the fragments of a datagram which will be helpful while reassembling the datagram as the encapsulator might fragment the datagram. For the Outer IP Header, a new number is generated.
IP has the task of delivering packets from the source host to the destination host solely based on the IP addresses in the packet headers. For this purpose, IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.
For example, in Point-to-Point Protocol, the packet is formatted in 8-bit bytes, and special characters are used to delimit elements. Other protocols, like Ethernet, establish the start of the header and data elements by their location relative to the start of the packet. Some protocols format the information at a bit level instead of a byte ...
The Type of Service field in the IP header was originally defined in RFC 791, and has been interpreted for IP Precedence and ToS ever since. The definition was largely derived from a US DoD Specification JANAP-128, which defines message multilevel precedence and preemption. It defined a mechanism for assigning a precedence to each IP packet, as ...
No label present. All receivers shall process this packet. 11 Label re-use: no label is present; the label is the same as the previous GSE packet in the same base band frame. LT=11 is also used for intermediate and end packets (i.e. Start bit 0). LT=11 shall not be used for the first GSE packet in a base band frame with Start bit 1.
Loose Source Routing is an IP option which can be used for address translation. LSR is also used to implement mobility in IP networks. [3] Loose source routing uses a source routing option in IP to record the set of routers a packet must visit. The destination of the packet is replaced with the next router the packet must visit.