downloading from LAN is 10 times slower than downloading from internet

Rasi · 2011-02-01 17:33:28

Hi, i bought a netbook these days (samsung n220) and wanted to copy some stuff over to it.
but for some reason my transfers over LAN (using a cable) are VERY slow (70KB/s). Transfers using WLAN are the same, once again 70KB/s.

Downloading stuff from the internet works on both machines. Speed is around 700KB/s.

I am using a Turbolink JDR454 Router, which, i know, sucks, but it shouldnt be _that_ bad.
The network cards shouldnt be the issue, neither should the cable since internet transfers work just fine.

Any idea about this?

Awebb · 2011-02-01 18:57:01

Start with telling us hwo you transfer the data.
Continue with testing the transfer rate when using a patch cable (twisted pairs indeed).
Are there any special settings that can be done in your router?

Rasi · 2011-02-01 20:38:46

Awebb wrote:

Start with telling us hwo you transfer the data.
Continue with testing the transfer rate when using a patch cable (twisted pairs indeed).
Are there any special settings that can be done in your router?

I checked all the options in the router. Doesnt seem like it. Transfer rates are always identical, no matter which protocol. I tried ssh, ftp and http.

Will check the cable thing, tho I dont understand it, because if the cable limits transfer, it should be slow from internet too.

Last edited by Rasi (2011-02-01 20:44:25)

defears · 2011-02-01 21:53:02

I seem to have the same problem. But everything works perfectly. Just slow.

I just started useing ssh a lot and noticed I cap out at 7 megs a second between 5 completly diffrent computers and laptops. (Acer quadcore with nvidia, Intel desktop 3.2Ghz, core2duo laptop, 6 year old pentium 4 something, and 5 year old Acer Aspire) That's with cp,sftp,ftp,ssh, and samba. Iperf every combo and still 7 tops. All cabled to a switch after the router which detects no collisions at all.

But here is the strange part. All 5 computers get 14 megs download with speedtest.net.

foutrelis · 2011-02-01 23:00:11

defears wrote:

I just started useing ssh a lot and noticed I cap out at 7 megs a second between 5 completly diffrent computers and laptops.
<snip>
But here is the strange part. All 5 computers get 14 megs download with speedtest.net.

speednet.net shows Mb/s (millions of bits per second), while various desktop applications show MB/s (millions of bytes per second). One byte is equal to 8 bits, so there's nothing wrong about the numbers you posted.

OP: Some things to try:

Reboot the router. If that doesn't help, reset it (i.e.: restore its factory settings).
Inspect the packets sent/received with Wireshark. Maybe it'll give you a hint or two about what's going on.
If possible, try a different router.
Connect the two computers directly using a patch or crossover cable. You can also make them talk to each other using their link-local IPv6 addresses.

Last edited by foutrelis (2011-02-01 23:18:03)

.:B:. · 2011-02-02 08:53:58

defears wrote:

I seem to have the same problem. But everything works perfectly. Just slow.
I just started useing ssh a lot and noticed I cap out at 7 megs a second between 5 completly diffrent computers and laptops. (Acer quadcore with nvidia, Intel desktop 3.2Ghz, core2duo laptop, 6 year old pentium 4 something, and 5 year old Acer Aspire) That's with cp,sftp,ftp,ssh, and samba. Iperf every combo and still 7 tops. All cabled to a switch after the router which detects no collisions at all.
But here is the strange part. All 5 computers get 14 megs download with speedtest.net.

Open your own topic, don't hijack other people's topics.

https://wiki.archlinux.org/index.php/Fo … _Hijacking

fukawi2 · 2011-02-02 10:53:28

Smells like MTU possibly... Are both machines set to the same MTU? Generally on a LAN they should both be at 1500

Rasi · 2011-02-25 21:14:06

well. I uninstalled networkmanager on the netbook and replaced it with wicd.
Suddenly all works. Speed with wifi is around 2MB/s and speed with ethernet is around 8MB/s now.

quantumphaze · 2011-06-29 08:56:47

I have an almost identical problem. When I initiate an FTP or SFTP transfer (send or get) from my Ubuntu machine it is running at 20-30kb/s. If I initiate it from the Arch machine it runs at full speed. The two machines are connected by a 100Mbit switch. Changing to WICD does not fix the problem.

On a quick investigation it appears that there is an 0.25 second delay between every 4 TCP ack pair.

rmadla · 2011-08-03 16:17:06

.:B:. wrote:

defears wrote:
I seem to have the same problem. But everything works perfectly. Just slow.
I just started useing ssh a lot and noticed I cap out at 7 megs a second between 5 completly diffrent computers and laptops. (Acer quadcore with nvidia, Intel desktop 3.2Ghz, core2duo laptop, 6 year old pentium 4 something, and 5 year old Acer Aspire) That's with cp,sftp,ftp,ssh, and samba. Iperf every combo and still 7 tops. All cabled to a switch after the router which detects no collisions at all.
But here is the strange part. All 5 computers get 14 megs download with speedtest.net.
Open your own topic, don't hijack other people's topics.
https://wiki.archlinux.org/index.php/Fo … _Hijacking

It sounds to me as though defears may truly have the same problem - in which case this isn't hijacking, it's adding data to the issue.

Arch Linux

#1 2011-02-01 17:33:28

downloading from LAN is 10 times slower than downloading from internet

#2 2011-02-01 18:57:01

Re: downloading from LAN is 10 times slower than downloading from internet

#3 2011-02-01 20:38:46

Re: downloading from LAN is 10 times slower than downloading from internet

#4 2011-02-01 21:53:02

Re: downloading from LAN is 10 times slower than downloading from internet

#5 2011-02-01 23:00:11

Re: downloading from LAN is 10 times slower than downloading from internet

#6 2011-02-02 08:53:58

Re: downloading from LAN is 10 times slower than downloading from internet

#7 2011-02-02 10:53:28

Re: downloading from LAN is 10 times slower than downloading from internet

#8 2011-02-25 21:14:06

Re: downloading from LAN is 10 times slower than downloading from internet

#9 2011-06-29 08:56:47

Re: downloading from LAN is 10 times slower than downloading from internet

#10 2011-08-03 16:17:06

Re: downloading from LAN is 10 times slower than downloading from internet

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