On Thu, 7 Aug 2003, Jeroen Massar wrote:
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>
> Brian Widdas wrote:
>
> > On Thu, 7 Aug 2003, Markus Nigbur wrote:
> >
> > > Subject says it:
> > > Is it possible to determine if any random host is running IPv6?
> >
> > No.
> >
> > On an unswitched LAN, you could probably show that it was. Anything
> > else introduces too many unknowns (is the host down? Is it ignoring my
> > IPv6 traffic? What's its IPv6 address anyway?).
>
> Ehm ofcourse there is :)
>
> ping6 -I <interface> ff02::1
>
> bingo, all hosts on your local network, even switched.
> (ff02::2 for all routers etc)
>
> Ofcourse hosts could filter that but then they are not entirely RFC-compliant.
But for this one you have to sit on the local network. Remotely it is
impossible to detect.
Regards,
Janos
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