Hello everybody, I am having a connection speed issue between two ppp based servers, and I have no idea what is going wrong and how to fix it. I would appreciated it if somebody with advanced networking skills can take a look at my attachments with tcpdumps and my analyse report. http://filebin.ca/hgnpt/tcpdumps.tar.gz I did not know a more suited mailing list for this issue. Many thanks in advance, Kind regards, Jelle
------------------------------------------------------------------------ # this document describes my issue with a way to slow transfer speed # between my sammy server with pppoe g.shdsl and an alix05 server with # ppp hsdpa umts ------------------------------------------------------------------------ # two download tests, demonstrating that the alix05 server can download # with 250KB/s (umts hsdpa 3g) alix05:~# wget -cr http://ftp.nl.debian.org/debian/ls-lR.gz FINISHED --2010-01-10 18:26:01-- Downloaded: 1 files, 6.4M in 26s (252 KB/s) FINISHED --2010-01-10 18:30:31-- Downloaded: 1 files, 6.4M in 25s (258 KB/s) # one upload test to the sammy server, demonstrating that the alix05 # server can upload with 60KB/s and that the sammy server can download # with at least 60KB's (umts hsdpa 3g) alix05:~# scp ftp.nl.debian.org/debian/ls-lR.gz root@xxxxxxxxxxxxxxxxxx:/root/ 100% 6578KB 60.9KB/s 01:48 # one upload from the sammy server to the ashley server, demonstrating # that the sammy server can upload with 274KB/s. (g.shdsl) sammy:~# scp /root/ls-lR.gz root@xxxxxxxxxxxxx:/root/ 100% 6578KB 274.1KB/s 00:24 ### THIS IS THE ISSUE, THE DOWNLOAD SPEED OF 17KB/s IS WAY TO LOW ### # one download from sammy server to alix05 server that is going to slow alix05:~# scp root@xxxxxxxxxxxxxxxxxx:/root/ls-lR.gz ls-lR.gz 100% 6578KB 17.4KB/s 06:19 # control test, downloading from the ashley server to demonstrate that # the alix05 is capable of download at least with 97KB/s with scp alix05:~# scp root@xxxxxxxxxxxxx:/root/ls-lR.gz ls-lR.gz 100% 6578KB 96.7KB/s 01:08 ------------------------------------------------------------------------ root@ashley:~# tcpdump port 22 and host 62.140.137.45 -i eth1 -n -vv | tee tcpdump-ashley-eth1.txt from alix05:~# scp root@xxxxxxxxxxxxx:/root/ls-lR.gz ls-lR.gz 100% 6578KB 96.7KB/s 01:08 ------------------------------------------------------------------------ sammy:~# tcpdump port 22 and host 62.140.137.45 -i ppp0 -n -vv | tee tcpdump-sammy-ppp0.txt from alix05:~# scp root@xxxxxxxxxxxxxxxxxx:/root/ls-lR.gz ls-lR.g 100% 6578KB 13.9KB/s 07:52 ------------------------------------------------------------------------ # othertests: # scp root@xxxxxxxxxxx:/root/ls-lR.gz ls-lR.g ------------------------------------------------------------------------
