How to preempt rogue RAs?

Martin Millnert martin at
Sat Oct 30 11:31:20 CEST 2010

Hi Tore,

On Sat, October 30, 2010 10:53 am, Tore Anderson wrote:
> Hi list,
> (We suspect they
> are running Windows Internet Connection Sharing but aren't quite sure.
> Any insight here would be very welcome.)  These rogue RAs gets picked up
> by all the other clients and cause trouble, especially for Mac OS X
> users as they prefer the defective 6to4 connectivity over the proper
> IPv4 one.

A very ingenious tactic to handle the Windows ICS disaster is simply to
set the preference of the proper announcements higher than normal.  This
allegedly makes at least Windows prefer the higher preference
announcements over others, especially the ICS because they go out as
normal.  (Hint for MS; why not announce ICS RAs with lowest possible

I have a patched quagga/zebra lying around somewhere, maybe i could make a
patch out of it some day...

Martin Millnert <martin at>

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