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IPv4 is the fourth version in the development of the Internet Protocol, and routes most traffic on the Internet. [1] [non-primary source needed] The IPv4 header includes thirteen mandatory fields and is as small as 20 bytes. A fourteenth optional and infrequently used options field can increase the header size.
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.
The first header field in an IP packet is the Version field. For IPv4, this is always equal to 4. Internet Header Length (IHL): 4 bits The IPv4 header is variable in size due to the optional 14th field (Options). The IHL field contains the size of the IPv4 header; it has 4 bits that specify the number of 32-bit words in the header.
The IP header is different from the modern IPv4 header. IEN 44 Latest Header Formats ( June 1978) describes another version of IPv4, also with a header different from the modern IPv4 header. IEN 54 Internetwork Protocol Specification Version 4 ( September 1978) is the first description of IPv4 using the header that would become standardized in ...
This page was last edited on 13 May 2024, at 08:02 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
The Internet checksum, [1] [2] also called the IPv4 header checksum is a checksum used in version 4 of the Internet Protocol (IPv4) to detect corruption in the header of IPv4 packets. It is carried in the IP packet header , and represents the 16-bit result of summation of the header words.
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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.