Checksum Error Ip Tcp Udp
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Icmp Checksum Error
Overall: Level 67 TCP/IP 9 Message Active today Accepted Solution by:Qlemo2011-01-16 Because it is designed that way. TCP requires packets to be acknowledged every now and then, which is part of the TCP protocol. UDP needs a application layer negotiation method used, if needed. Usually UDP application protocols implement a similar handshake as used by TCP, or none at all (broadcasts for example, or notifs about unimportant changes). 0 LVL 24 Overall: Level 24 TCP/IP 6 Message Expert Comment by:rfc11802011-01-16 I will try and answer your question as completely as I can; IP is a layer 3protocol as you might already know. IP is best effort only; the concept is this, each router along the path will analyze the checksum and discards the packet when it can not be verified as a solid packet without any notifications sent to the sending host as it is assumed that higher layer protocols will handle the notifications, retransmits, etc. Why forward a packet if the checksum is invalid? The router must check that the received packet is properly formed for the protocol before it proceeds with protocol processing. TCP is a reliable, connection oriented protocol as you already know, in that every packet MUST be acknowledged. TCP checksum is used to detect errors after transmitting packet and in case of an error, the packet is dropped and retransmission occurs as it is cheaper than repair. Unlike UDP, UDP is an unre
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss http://stackoverflow.com/questions/4529604/how-do-tcp-and-udp-detect-transmission-errors the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users 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 each other. Join them; it only takes a minute: Sign up How do TCP and UDP detect transmission errors? up vote 2 down vote favorite I want to know that how these protocols can detect that an error has been occurred during the data transmission? thanks network-protocols share|improve this question edited Dec 25 '10 at 7:33 Greg Hewgill ip tcp udp 509k1088771043 asked Dec 25 '10 at 7:22 user472221 78061840 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote There are different errors that can occur: Incorrect order of the packets Loss of packets Corrupt data inside the packet Phantom packets (receiver gets packets that have never been sent) UDP only provides a mechanism to overcome the corruption of data (which is an optional feature in IPv4, mandatory in IPv6). Corruption of Data UDP is only resistant against the corruption of data inside packets, if the checksum field is used in the header of every packet. Basically it takes the header, the packet content and some more information (like IP addresses), interprets this as a long list of 16 bit words in ones-complement and sums them up UDP checksum. TCP has a similar approach to tackle corruption of data. All the other problems TCP has so-called sequence numbers for every packet. The sequence number addresses bytes, so if the sender says "this is the packet with sequenc