To quote Douglas Comer : "An Application Program that uses UDP accepts full responsibility for handling the problem of reliability, including mesage loss, duplication, delay, out-of-order delivery and loss of connectivity. Unfortunately, application programmers often ignore these problems when designing software. Furthermore, because programmers often test network software using highly reliable, low delay local area networks, testing may not expose potential failures. Thus, many application programs that rely on UDP work well in a local environment but fail in dramatic ways when used in a larger TCP/IP internet."
The TFTP program isn't designed to tranfer files over such a large network. If the programmers wrote reliability into the TFTP software they would basically be copying the TCP code into the TFTP code, of which there is no point since TCP exists. TFTP is thus used over reliable media like LAN's and FTP over either. HTH, Phil. --- "Ouellette, Tim" wrote: > Hey All. I was wondering if someone could help me > out with a problem i'm > working on. It's very weird to me and I can't find > any reason why this may > be happening other than possible a Queuing issue. > Please comment. > > I've done some testing to show the response > issues from spikinisse > to an auburn hills tftp/ftp box. When a 9 meg > file is copied from one of the 6509's in > Spijkenisse using tftp we > see a speed of 4k/sec (9041904 bytes copied in > 2251.956 secs (4016 > bytes/sec) > However, when I ftp'd a 2meg file from a server in > Spijkenisse to > the same server in Auburn Hills, I see a speed of > 166k/sec (2024013 bytes > sent in 12 > seconds (166.12 Kbytes/s) Seeing as in > Spijkinisse it is > approximately 8pm and they have 4 E1's, there should > not be an issue with > over-utilization. > It intrigue's me as to how a UDP based application > (tftp) can have > such a ridiculously slow speed of 4k/sec and a TCP > based application (ftp) > has an > average speed (considering 4 e1's) of 166k/sec. > > Spikinisse has a group of E1's to the cloud and our > site in Auburn > Hills has a full DS3 to the cloud. > > Spik is in the Netherlands, and Auburn Hills is in > the US. Any more > information I need to provide? [EMAIL PROTECTED] ____________________________________________________________ Nokia Game is on again. Go to http://uk.yahoo.com/nokiagame/ and join the new all media adventure before November 3rd. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=23361&t=23361 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
