nanog mailing list archives
Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6)
From: Jeroen Massar <jeroen () unfix org>
Date: Wed, 01 Jun 2011 13:38:20 +0200
On 2011-Jun-01 13:18, Tim Chown wrote:
On 31 May 2011, at 22:31, Voll, Toivo wrote:Netalyzr (http://n3.netalyzr.icsi.berkeley.edu/analysis) finds no issues with my IPv6 status, but alerts me to the fact (since confirmed by switching to IE) that Google Chrome defaults to IPv4 rather than IPv6, and consequently a lot of the testing tools claim that my IPv6 is broken.I'm a little confused there - the current Chrome prefers IPv6, and also now includes code to allow fast failover to IPv4 in the event IPv6 connectivity is down/slow (300ms headstart). I had some issues with Netalyzer detecting my dual-stack status, which the chaps there are helping with.
Netalyzer is Java-based, thus it uses the Java stack and not the Javascript/ECMAScript stack that Chrome provides. As such it just bypasses all of that and the coolest thing is that you might not even have an IPv6-capable Java stack for your host. The 1.6.0_25-b06 Oracle/Sun version on Windows that I have here seems to do IPv6 just fine btw in combination with Netalyzr. Apparently in my home case I have a slow DNS lookup (odd, never had issues with that, maybe it has to do with me having to click 'accept' on the windows firewall UI ;) 8<----------------------------------------------- It takes 239 ms for your computer to fetch a response from our test server using IPv6, while it takes 7289 ms for the same host to fetch a response using IPv4 from the same server. ----------------------------------------------->8 Definitely has to do with clicking 'ok' on the firewall button ;) Greets, Jeroen
Current thread:
- Re: Yahoo and IPv6 Steve Clark (Jun 01)
- <Possible follow-ups>
- Re: Yahoo and IPv6 Tim Chown (Jun 01)
- Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Jeroen Massar (Jun 01)
- Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Atticus (Jun 01)
- Re: Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Valdis . Kletnieks (Jun 01)
- Re: Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Jeroen Massar (Jun 01)
- Re: Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Valdis . Kletnieks (Jun 01)
- Berkely Netalyzr for IPv6/IPv4 testing (Was: Yahoo and IPv6) Jeroen Massar (Jun 01)