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

[Ankur Puri]

Narelle

 

The TCP sessions for normal day application like Google maps or iTunes etc.
is quite substantial. There is a limitation of number of sessions than can
pass through the NAT, which is again hardware dependent.

 

Having carrier grade NAT will be very hardware intensive and eventually
requires substantial capex, which begs a question if it is rather better for
carriers and ISPs to look at migration plans to IPv6 than delaying the
eventual.

 

Regards

Ankur Puri

NTT Australia Pty Ltd

P: +61 2 8915 8948 | F: +61 2 9251 5749 | M: +61 433 114 275

W: www.au.ntt.com | Global IP Network (GIN): www.ntt.net
<http://www.ntt.net/english> 

 

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Narelle
Sent: Wednesday, 19 May 2010 10:40 PM
To: Mark Newton
Cc: ausnog at ausnog.net
Subject: Re: [AusNOG] SMH: "No room at the internet"

 

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

_______________________________________________

AusNOG mailing list

AusNOG at lists.ausnog.net

http://lists.ausnog.net/mailman/listinfo/ausnog

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ausnog.net/pipermail/ausnog/attachments/20100520/3e00e4b2/attachment.html>