v6 subnet size for DSL & leased line customers

Leo Bicknell bicknell at ufp.org
Wed Dec 26 16:26:03 UTC 2007

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.

Having not looked in great detail, I am unclear if IPv6 has done
something to fix this concern or not.

Is this feature going to get turned off when the first worm comes along
that spoofs RA's

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request at tmbg.org, www.tmbg.org
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