[158287] in North American Network Operators' Group
Re: "Programmers can't get IPv6 thus that is why they do not have
daemon@ATHENA.MIT.EDU (Mark Andrews)
Tue Nov 27 16:39:29 2012
To: Joseph Holsten <joseph@josephholsten.com>
From: Mark Andrews <marka@isc.org>
In-reply-to: Your message of "Tue, 27 Nov 2012 21:23:55 -0000."
<84F8DEBC-C754-4D06-99B0-405CC8A358BD@josephholsten.com>
Date: Wed, 28 Nov 2012 08:31:51 +1100
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
In message <84F8DEBC-C754-4D06-99B0-405CC8A358BD@josephholsten.com>, Joseph Hol
sten writes:
> On 2012-11-27, at 21:07, Jeroen Massar wrote:
> > As such, if an application does not do proper IPv6 today the people in
> > charge of the thing simply did not care...
>
> Or do care.=20
>
> =46rom http://wiki.apache.org/hadoop/HadoopIPv6:
> > Apache Hadoop does not currently support IPv6 networks, it uses IPv4 =
> addresses for communicating between nodes. This is because Hadoop is =
> designed to work in private datacenters, which usually have private IP =
> addresses in the 10.x.x.x address space.
> >=20
> > =95 Using IPv4 addresses everywhere provides a single form of =
> TCP addressing for all our tests. Different network configurations (DNS, =
> reverse DNS, DNS caching) still provide lots of problems and performance =
> issues, but there is no need to worry about which IP protocol version is =
> used.
> > =95 Shorter addresses make for shorter packets, which can have a =
> benefit on busy networks.
> >=20
> > This does not mean that the Hadoop team thinks that IPv4 is the best =
> ever network protocol and that there is no reason to upgrade ever, only =
> that it works well in datacenters.=20
>
> (Yes, I am technically trolling. But mostly because I don't have the =
> energy to fight for IPv6 any more. Maybe you do?)
Most of which is just FUD.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
