Internet Protocol (IP) Packet Format


The Internet Protocol specified in RFC 791 defines the IP packet format. The IP packet header has specific fields that contain information about the packet and about the sending and receiving hosts. Below is a list of the fields in the IP header and a brief description for each one. You should already be familiar with destination IP address, source IP address, version, and Time To Live (TTL ) fields. The other fields are important but are outside the scope of this course.
Version - Version number (4 bits); predominant version is IP version 4 (IPv4)
IP header length - Header length in 32-bit words (4 bits)
Precedence and type of service - How the datagram should be handled (8 bits); the first 3 bits are precedence bits (this use has been superseded by Differentiated Services Code Point [DSCP], which uses the first 6 bits [last 2 reserved])
Packet length - Total length (header + data) (16 bits)
Identification - Unique IP datagram value (16 bits)
Flags - Controls fragmenting (3 bits)
Fragment offset - Supports fragmentation of datagrams to allow differing maximum transmission units (MTUs) in the Internet (13 bits)
Time to Live (TTL) - Identifies how many routers can be traversed by the datagram before being dropped (8 bits)
Protocol - Upper-layer protocol sending the datagram (8 bits)
Header checksum - Integrity check on the header (16 bits)
Source IP address - 32-bit source IP address (32 bits)
Destination IP address - 32-bit destination IP address (32 bits)
IP options - Network testing, debugging, security, and others (0 or 32 bits, if any)

2 comments:

eakarit on October 12, 2008 at 5:34 PM said...

I like ur blog!!

You can add business opportunities with my blog which to be Multiply Make Money Online Alternative, It help increase revenue from ur blog/Website so much

Detail More at http://businesssitesguide.blogspot.com ;) .

Anonymous said...

well job done.nice post keep posting.

Post a Comment

 

NBA Live Streaming. Copyright 2008 All Rights Reserved Revolution Two Church theme by Brian Gardner Converted into Blogger Template by Bloganol dot com | Distributed by Blogger Templates Blog