Checksum Error Rate
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about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users checksum error windows 7 Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping checksum error fix each other. Join them; it only takes a minute: Sign up Error Rate in TCP checksum? [closed] up vote 4 down vote favorite 2 TCP and UDP(sometimes) use a simple checksum to make sure the contents are correct. What
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I want to know is any empirical data or estimate, of how often a packet is corrupted, but has the correct checksum for a person with a standard computer and internet connection. Now I know that this probably all varies widely with ISP quality, hardware quality, and more, but I just want to hear any information on this. networking tcp udp share|improve this question asked May 24 '09 at 2:30 Unknown 29.4k15104162 closed as off topic by
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andrewsi, Bot, tripleee, the Tin Man, James Montagne Sep 6 '12 at 20:24 Questions on Stack Overflow are expected to relate to programming within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question. add a comment| 2 Answers 2 active oldest votes up vote 3 down vote accepted You're asking how long a piece of rope is. In general, unless there's something wrong, the error rate should be less than 10-7. On the other hand, wireless, 3G, and such can have significantly higher error rates. This Google search will show you there's a lot of literature. share|improve this answer answered May 24 '09 at 2:37 Charlie Martin 76.9k15136217 I think 10-7 is a little too high. 1-(1-10^-7)^(5 gigabytes / 1500 bytes) in Google, seems to indicate a 30% probability of failure when transferring 5 gigabytes. I have never seem to have encountered such an error. –Unknown May 24 '09 at 2:55 1 Well, that's less than. But then it depends on the hardware, too. An Ethernet connection may well have more than that but catch them at the hardware layer and never propagate
What http://stackoverflow.com/questions/902938/error-rate-in-tcp-checksum can I do to prevent this in the future? If you are on a personal connection, like at home, you https://www.wireshark.org/docs/wsug_html_chunked/ChAdvChecksums.html can run an anti-virus scan on your device to make sure it is not infected with malware. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. CloudFlare Ray ID: 2eccac5f9c6f27ec • Your IP: 23.94.153.30 • Performance & security by CloudFlare
everyone knows is not always correct. The Ethernet frame check sequence check (FCS) and the IP and TCP checksums will protect your data from most but not all types of data corruption. This article will outline the types of http://noahdavids.org/self_published/CRC_and_checksum.html errors that will not be detected. The bottom line is that for any truly critical data you should either encapsulate the data in some form that will detect any corruption when you decapsulate it or at the very least transfer a hash (MD5, SHA-1, etc) of the data to confirm that the data has not been corrupted - or both. The Limitations of Ethernet Frame Check Sequence The Ethernet Frame Check Sequence (FCS) is a 32 bit checksum error CRC. The mathematical analysis of CRC error detection is a complex subject and I will not go into it here. Suffice to say that the Ethernet FCS will detect Any 1 bit error Any two adjacent 1 bit errors Any odd number of 1 bit errors Any burst of errors with a length of 32 or less Everyone agrees on the above but things become more nebulous when talking about bursts longer than 32 bits. Everyone agrees that checksum error rate some extremely small number of errors will still go undetected but actual numbers are hard to come by and no one seems to agree with anyone else. Part of the problem might be the term "error burst". An error burst is defined by 2 values. First is the number of bits between the first and last error bits, for example a Y bit error burst will have bit N and bit N+Y-1 in error. Second is the value of the guard band, this is the number of contiguous bits within those Y bits that can be correct. None of the references that I found mentioned the value of the guard band. Despite the vagueness of the error burst definition it would appear that the Ethernet CRC will detect the vast majority of errors. Unfortunately, "vast majority" is not "all". In addition, that majority is not as vast as the mathematics would lead you to believe. The problem is that the Ethernet FCS is recalculated by every Ethernet device between the source and destination. The calculation is done either by the Ethernet driver or on the chip itself. Any errors in the higher layer software of these devices or transient failures of the hardware (memory or bus) will result in the destination seeing an Ethernet frame with a valid FCS but containing corrupt data. To protect against these errors TCP is depende