On Fri, 25 May 2001, Oded Arbel wrote:
> There was an ISP in Singapure or something that prevented its home users
> from doing NAT, but this really isn't the thing here in Israel -
> Like so many has said - the ISP has no way to check - nor do they care -
> if you use 1 computer at home, or 3 through NAT. what the ISPs are trying
> to prevent is small buisnesses connecting through ADSL on NAT.
I believe there is a way to check that some user has number of computers
behind NAT. Although all outgoing packets will have same source IP address
some applications (for example Gnutella) may send inside of packet
internal IP address of computer they are running on. And packets from same
real IP containing inside different internal IPs most likely passed NAT.
I doubt that any ISP will ever bother to investigate your packets to check
that you're using NAT, but saying that it's completely undetectable isn't true.
Bye,
Boris
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