North American Network Operators Group

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Re: v6 subnet size for DSL & leased line customers

  • From: Florian Weimer
  • Date: Wed Dec 26 11:41:13 2007

* Leo Bicknell:

> In a message written on Tue, Dec 25, 2007 at 12:43:45AM -0500, Kevin Loch wrote:
>> RA is a shotgun.  All hosts on a segment get the same gateway.  I have 
>> no idea what a host on multiple segments with different gateways would 
>> do.  Hosting environments can get complex thanks to customer
>
> I would like to point out that in IPv4 we have ICMP Router
> Advertisement messages.  I have never seen them used on a production
> network.  I know one of the worries is security, that a compromised host
> could send out advertisements, drawing traffic to it that it can then
> snoop and pass on to the real gateway.

DHCP and ARP face the same issue.  That's why "one host per subnet" is
so appealing.