Question about IPAM tools for v6

Fernando Gont fgont at
Fri Jan 31 17:15:49 CET 2014

On 01/31/2014 01:02 PM, Alexandru Petrescu wrote:
>>> Speaking of scalability - is there any link layer (e.g. Ethernet) that
>>> supports 2^64 nodes in the same link?  Any deployed such link? I
>>> doubt so.
>> Scan Google's IPv6 address space, and you'll find one. (scan6 of
>> <> is your friend :-) )
> Do you think they have somewhere one single link on which 2^64 nodes
> connect simultaneously?  (2^64 is a relatively large number, larger than
> the current Internet).
> Or is it some fake reply?

Apparently, it's not fake (although I didn't scan the *whole* space). I
bet there's some trick there, though. -- I don't expect them to be
running 2**64 servers...

With a little bit more of research, it shouldn't be hard to check
whether the responses are legitimate or not (TCP timestamps, IP IDs,
etc. are usually your friends here).

Fernando Gont
SI6 Networks
e-mail: fgont at
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492

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