I am wondering if it is accurate to say that no errors have ever arisen even in the case of segment checksums matching values in checksum field when UPD receiver computes segments. Is there any truth in this?
We cannot say so because it only checks for syntax errors. It does not check the whole process which is the logical side. Test your program frequently for you to know if there are still errors on it.
You can view this site that somehow can help you to answer your questions.
http://securityhorror.blogspot.com/2012/03/simple-port-scanning.html
https://en.wikibooks.org/wiki/Communication_Networks/TCP_and_UDP_Protocols/UDP
I hope this can help.
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Hi,
You can’t say there is no errors. Because UDP protocol sent data without setup and If there are two bit message ,error will not be detected. That means all data send without acknowledgements. Therefore  UDP not perform a retransmission even they detect lost data. So you need to check every corresponding bits. Only after you can decide whether there is no errors or not.
