[AusNOG] SMH: "No room at the internet"

[Narelle]

On Wed, May 19, 2010 at 9:11 PM, Mark Newton <newton at internode.com.au> wrote:

> The NATs are going to be really atrocious, by the way. The IPv4 Internet
> will carry increasingly massive quantities of suck.

One thing that opened my eyes was a talk a few years back from an NTT
guy who'd done some measurements on TCP flows. They measured the
number of flows from a host in a few cases: sitting there, running a
few standard apps, running google maps, running itunes, and found a
huge variation, ie from 7 - hundreds.

Logically, this means in a "carrier grade NAT" you'd have to start
applying port restrictions in order to make sure everyone got 'fair
access', and they made a range of estimates based on typical buffer
sizes etc. Then retested the clients with restrictions, ie 5, 10, 50,
200... with proportionately less of the individual web pages and
applications actually working... it was really instructive to see
google maps not get all those tiles needed to be useful.

I was reminded of this recently when someone posted a request for
recommendations on proxies - due to P2P users squeezing out all the
other conference attendees when they had stolen all the available port
mappings. Take a look at the future...


-- 


Narelle
narellec at gmail.com