This list either filters my answers or mangles them. I'll make another try here. It it comes out mangled again, I'll post it somewhere on my Web site when I have time.
TFTP is a trivial protocol running on top of a trivial protocol (UDP). You shouldn't expect it to have good throughput. TFTP uses a block size of 512 bytes. The protocol is a command/reply (Ping-Pong protocol) with no windowing, flow control, etc. The protocol looks like this: Write Request-> If there are any problems, the application-layer TFTP notices a missing ACK and retransmits. FTP, on the hand uses TCP. It looks more like: SYN my segment (packet size) is 1500 SYN ACK my segment size is also 1500 ACK GET (FTP command), TCP receive window is 8,192 (or whatever)-> 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? ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=23391&t=23391 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
