[107020] in North American Network Operators' Group
Re: It's Ars Tech's turn to bang the IPv4 exhaustion drum
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Wed Aug 20 04:54:37 2008
From: Iljitsch van Beijnum <iljitsch@muada.com>
To: Randy Bush <randy@psg.com>
In-Reply-To: <48AB73E3.8090908@psg.com>
Date: Wed, 20 Aug 2008 10:54:26 +0200
Cc: Alain Durand <alain_durand@cable.comcast.com>, nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On 20 aug 2008, at 3:31, Randy Bush wrote:
> matsuzaki-san's preso, i think the copy he will present next week at
> apops:
> http://www.attn.jp/presentation/apnic26-maz-ipv6-p2p.pdf
He (she?) says packets will ping-pong across the link if they are
addressed to an address on the p2p subnet that isn't used. However,
this is only true if there is no address resolution on the subnet,
which would be the normal mode of operation with IPv4 on p2p links
because those links don't have addresses and there is no ARP. With v6
on the other hand, ND can work on all link types and PPP does
negotiate an address of sorts.
So whether this actually happens on a true point-to-point link is open
with IPv6, and if it's a point-to-point ethernet or similar link you
only get some neighbor discovery traffic that goes nowhere, not an
increase in actual traffic.
