Network checksum Calculation
1. Preface
Checksum calculation is the basic function of NAT and content modification. After performing these operations, you must modify the checksum in the Data header.
2. 16-bit checksum Calculation
2.1 Basic
MD5 Algorithm Introduction:MD5 Full name is the paper Digest to the algorithm (Message-digest ALGORITHM5), the algorithm for arbitrary length of information is calculated bitwise, resulting in a binary length of 128 bits (hexadecimal length is 32
Some days ago, an article N long ago suddenly became a hot topic for reading, after checking, I found that my page using that code for pr query could not normally get the URL PageRank value. some days ago, an article about N long ago suddenly became
ArticleDirectory
Related Links
Source builds
Release build: 3.3.2-LinuxFebruary 22,200 8. These downloads are provided underEclipse Foundation Software User Agreement.
Eclipse 3.3.2 readme
Btrfs is known as the next generation Linux file system. In recent years, EXT2/3 has encountered more and more extensibility problems, while looking forward to ext4, people have found Btrfs, it is said that it adopts a lot of advanced file system
Using Python to generate the file md5 checksum function,
Preface
In linux, there is a command called md5sum, which can generate the md5 value of the file. Generally, the result is recorded in a file for verification. For example, it will be used as
Objective
In Linux there is a command called md5sum, can generate the MD5 value of the file, in general, the results will be recorded in a file for validation use, such as the use of:
[Crazyant@localhost pythonmd5]$ more Sample_file
Installed Package ChecksumRpm-v Installed package Name-V verifies the files in the specified RPM packageRpm-v PTHNo hints, no changes have been made since the installationFile extraction in RPM packageFor example, to a system configuration file
Linux to verify the file MD5 value, the easiest way is to execute the md5sum commandmd5sum filenameOriginally intended to use subprocess to invoke system commands to get MD5 values,
Import Subprocess,shlex
cmd = "md5sum filename"
p = subprocess
Rpm-v httpd See if the file information in the installed Apache package has been modified by someoneRPM-/etc/httpd/conf/httpd.conf Edit Modify the Apache package configuration file httpd.confEnter "402G" in command mode and jump to line 402Enter "A"
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