IT Operations Manager
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2008 Neuchâtel
Switzerland
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----- Original Message ----
De: swinog-bounces@lists.swinog.ch de la part de
Stanislav Sinyagin
Date: sam. 28.02.2009 23:53
À:
swinog@swinog.ch
Objet : Re: [swinog] IPV6 Go (lazy
providers)
> You would be
surprised how many of the "plastic boxes" support IPv6
> today or
can be made to support it with a simple software update. It
> might
not be widely advertized yet.
I played around with Embedded Linux on such
devices, and I can tell two things:
-- vast majority of those boxes are
too limited in flash and RAM size: 4MB flash
on a router is very common,
sometimes it's even 2MB. 16MB RAM is common, and
rarely there's
32MB.
What you can fit into 2MB flash is Linux kernel 2.4.x, plus some
very
limited number of libraries, daemons and utilities. Also, even the
newest 2.6.x
kernel is permanently popping up with ipv6 improvements and
bugfixes. It is physically
impossible to run a 2.6.x Linux system from 2MB
flash. You can, however, run it from
4MB, and there's even some room for
ipv6. The dd-wrt software for Linksys
routers seems to support it, but I
didn't test it.
Some of those devices are hardware-fixed to little endian
architecture,
even if the CPU allows running either BE or LE (bit noth both
at the same time).
In LE architectures, you have to swap bytes in every
packet header in
order to get the IP address or TCP port number. This slows
down ipv6
processing significantly, as there are many more bytes to
swap.
-- as I wrote before, none of the consumer electronics vendors has
given any hint
of v6 compatibility on any box that I looked at in mediamarkt.
Try searching for ipv6
at brack.ch or digitec.ch - you will find as many
devices there. When there's demand,
the vendors will come up with new
hardware, and the old one will be obsolete.
Cool, geeks will have tons of
free hardware to play with :-)
> Remember this discussion is
about OFFERING IPv6. Not REQUIRING IPv6.
> IPv4 will stay here for
quite some time but an upgrade path has to be
> established. This is
a long term transition and the IPv6 standards
> have lots of things
in them to allow a smooth transition. And the
> first steps are the
backbones. Today all the good ones have IPv6 in
> the core. And if
not, you can use IPv4/IPv6 tunnels. Mainstream
> operating systems
all have IPv6 support built in. The access link is
> now the last
hurdle. The standards are there. You just have to plan
> and
execute.
I thought we discussed this already. OFFERING requires
significant
investments at the ISP side. They will not go for it before
there's a pressure,
either from technology or from the customers. Consider a
big enough ISP with, say,
500 routers. Apart from hardware costs, the whole
planning, testing, and deployment
is at the level of 2-3 thousand man-hours,
or at the level of ~500k CHF.
And that's only the core infrastructure. Taking
ipv6 to the end user, be it Docsis or
xDSL, is even more expensive, because
you need to upgrade all the user-reated
components, such as provisioning
system, call center, billing, CPE hardware
and software, etc. Are you ready
to spend few hundred thousand now
on something that will bring the new
customers in
2014?
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