[179884] in North American Network Operators' Group
Re: Thousands of hosts on a gigabit LAN, maybe not
daemon@ATHENA.MIT.EDU (Bruce Simpson)
Sun May 10 01:30:05 2015
X-Original-To: nanog@nanog.org
Date: Sun, 10 May 2015 05:01:42 +0100
From: Bruce Simpson <bms@fastmail.net>
To: nanog@nanog.org
In-Reply-To: <1431210834.6801.48.camel@karl>
Errors-To: nanog-bounces@nanog.org
On 09/05/2015 23:33, Karl Auer wrote:
> IPv4 ARP, for example, hits every on-subnet neighbour; the IPv6
> equivalent uses multicast to hit only those neighbours that happen to
> share the same 24 low-end L3 address bits as the desired target - a
> statistically much smaller subset of on-link neighbours, and in "normal"
> subnets typically only one host. Only chatter that really should go to
> all hosts does so - such as router advertisements.
>
Except when the IPv6 solicited-node multicast groups cause $VENDOR
switch meltdown:
http://blog.bimajority.org/2014/09/05/the-network-nightmare-that-ate-my-week/
