Forum - Trying to Track Down Speed Problems :: SixXS

Trying to Track Down Speed Problems

Shadow Hawkins on Wednesday, 15 May 2013 20:33:40

I'm trying to track down a speed problem I'm having with IPv6 traffic. My POP is usphx01. ipv6-speedtest.net is showing 0.31 Mpbs down and 0.45 Mpbs up. I saw someone had a couple of links for doing wget downloads so I ran the using a different file: IPv4: windwalker:/tmp# wget -4 http://mirror.speedpartner.de/centos/6.4/isos/x86_64/CentOS-6.4-x86_64-netinstall.iso --2013-05-15 14:22:11-- http://mirror.speedpartner.de/centos/6.4/isos/x86_64/CentOS-6.4-x86_64-netinstall.iso Resolving mirror.speedpartner.de (mirror.speedpartner.de)... 91.184.32.5 Connecting to mirror.speedpartner.de (mirror.speedpartner.de)|91.184.32.5|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 241172480 (230M) [application/octet-stream] Saving to: `CentOS-6.4-x86_64-netinstall.iso' 100%[========================================================================================================>] 241,172,480 3.42M/s in 59s 2013-05-15 14:23:11 (3.90 MB/s) - `CentOS-6.4-x86_64-netinstall.iso' saved [241172480/241172480] IPv6: windwalker:/tmp# wget -6 http://mirror.speedpartner.de/centos/6.4/isos/x86_64/CentOS-6.4-x86_64-netinstall.iso --2013-05-15 14:23:38-- http://mirror.speedpartner.de/centos/6.4/isos/x86_64/CentOS-6.4-x86_64-netinstall.iso Resolving mirror.speedpartner.de (mirror.speedpartner.de)... 2a01:198::5 Connecting to mirror.speedpartner.de (mirror.speedpartner.de)|2a01:198::5|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 241172480 (230M) [application/octet-stream] Saving to: `CentOS-6.4-x86_64-netinstall.iso' 7% [=======> ] 18,489,393 41.0K/s eta 56m 5s So essentially, 3.42MB/s for IPv4 compared to 41KB/s for IPv6. I could not find any files to download from highwinds to test the pop directly. The MTU on my linux firewall/router is 1280. What other data do I need to gather to try and trouble shoot where the issue is?

Trying to Track Down Speed Problems

Jeroen Massar SixXS Staff

on Thursday, 16 May 2013 11:42:50

My POP is usphx01.

You are in the US.

ipv6-speedtest.net is showing 0.31 Mpbs down and 0.45 Mpbs up.

Typically they are using a testbox in France

I saw someone had a couple of links for doing wget downloads so I ran the using a different file:

IPv4:

windwalker:/tmp# wget -4 http://mirror.speedpartner.de/centos/6.4/isos/x86_64/CentOS-6.4-x86_64-netinstall.iso

That is a box in Germany. If you want to do 'speedtests', you might want to closer to you.

So essentially, 3.42MB/s for IPv4 compared to 41KB/s for IPv6.

Please see the FAQ for a whole list of things that could cause this.

I could not find any files to download from highwinds to test the pop directly.

Highwinds is one of the companies providing oversized NNTP servers, quite a few of these are IPv6 enabled and have heavy use, try those. Alternatively, you might want to check http://speedtest.comcast.net/ Paths is everything though, and remember that both IPv4 and IPv6 have an influence.

The MTU on my linux firewall/router is 1280.

You might want to increase that, if possible (and of course on both your side and the PoP side), see the FAQ for more details.

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