Trivia: Puzzling eBay response (IP

Kurt Buff kurt.buff at
Thu May 22 21:55:47 UTC 2014

On Thu, May 22, 2014 at 1:49 PM, Ronald F. Guilmette
<rfg at> wrote:
> In message <CADy1Ce563EdYNeRasoHC-GyuXusNujkrdkdQSXQF6X52trUv0Q at>
> Kurt Buff <kurt.buff at> wrote:
>>On Thu, May 22, 2014 at 12:57 PM, Ronald F. Guilmette
>>> The password change request was made from:
>>> - IP address:
>>> - ISP host:
>>> ===========================================================================
>>> So, I mean, WTF?
>>> is indeed my correct static IP address, and is indeed the
>>> place from whence I changed my password yesterday.
>>> I really do wonder where the bleep they got from.
>>> Obviously, that's an RFC1918 address.
>>> I do suspect that that IP address has a lot more to do with them, and with
>>> the geography of their own internal network than it has to do with _my_ ISP.
>>Rather than incompetence, I'd first suspect Carrier Grade NAT.
> Please elaborate.  What is it, exactly, that you are suggesting actually
> has been assigned the RFC1918 address in question?
> Some box on eBay's network?
> Some box on my ISPs network?
> If the latter, then how exactly does this RFC1918 address end up getting
> routed to eBay?

I expect eBay performed a traceroute to your public address, and that
a box on your ISP's network has the address and emitted it
as the last hop before your public address. That's far from certain,
but it's the first thing I'd think.


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