A question in my university homework is why use the one s complement instead of just the sum of bits in a TCP checksum. I can t find it in my book and Google isn t helping. Any chance someone can point me in the right direction?
Thanks, Mike
A question in my university homework is why use the one s complement instead of just the sum of bits in a TCP checksum. I can t find it in my book and Google isn t helping. Any chance someone can point me in the right direction?
Thanks, Mike
Since this is a homework question, here is a hint:
Suppose you calculated a second checksum over the entire packet, including the first checksum? Is there a mathematical expression which would determine the result?
Probably the most important is that it is endian independent.
Little Endian computers store hex numbers with the LSB last (Intel processors for example). Big Endian computers put the LSB first (IBM mainframes for example). When carry is added to the LSB to form the 1 s complement sum) it doesn t matter if we add 03 + 01 or 01 + 03: the result is the same.
Other benefits include the easiness of checking the transmission and the checksum calculation plus a variety of ways to speed up the calculation by updating only IP fields that have changed.
I have the following available: last reported lat,lon w/timestamp target lat,lon estimated time to target heading How can I interpolate an estimated position over time? I know that s enough to ...
I am trying to add a table of contents for my LaTex document. The issue I am having is that this line: subsubsection{The expectation of (X^2)} Causes an error in the file that contains the ...
I am having a problem handling large numbers. I need to calculate the log of a very large number. The number is the product of a series of numbers. For example: log(2x3x66x435x444) though my actual ...
I have to write an algorithm in AS3.0 that plots the location of points radially. I d like to input a radius and an angle at which the point should be placed. Obviously I remember from geometry ...
I m using Electro in Lua for some 3D simulations, and I m running in to something of a mathematical/algorithmic/physics snag. I m trying to figure out how I would find the "spin" of a sphere of a ...
I have two rows of numbers ... 1) 2 2 1 0 0 1 2) 1.5 1 0 .5 1 2 Each column is compared to each other. Lower values are better. For example Column 1, row 2 s value (1.5) is more ...
I ve implemented this method in Javascript and I m roughly 2.5% out and I d like to understand why. My input data is an array of points represented as latitude, longitude and the height above the ...
Given a coordinate (lat, long), I am trying to calculate a square bounding box that is a given distance (e.g. 50km) away from the coordinate. So as input I have lat, long and distance and as output I ...