[Dxspider-support] fraud detection

[Philip Gladstone]

The same public IP will not exist in more than one location. However, 
there can be *lots* of subscribers behind a single IP address 
(especially in mobile networks). The big carriers use boxes called 
Carrier Grade NATs to do the translation. Technically they are not NAT 
boxes but PAT boxes -- i.e. they can map more than one subscriber onto a 
single address at the same time. This is the same type of system that 
most people have at home to allow multiple people to connect to the 
internet from a single house.

IPv6 will help this situation as it gets rolled out -- then each 
subscriber will get 2^64 addresses (or more) for use inside the house.

Philip

p.s. I am a networking geek.

On 12/11/2011 7:01 PM, EA7UU Jesus wrote:
> Hello all
>
>     I agree with Béla and Roland; Jim I'm not an expert in networking 
> but it's very strange that same public IP address would coexist in two 
> or more ISP, but more curious is that different worldwide callsign 
> share the same IP address and connect at same DXCluster, magic or IP 
> miracle?.
>
>    During this weekend W6MSW was connected in my dxcluster, this 
> callsign not exist in FCC database and their IP address was from 
> Dominican Republic. Also, have a look for EA7ST (EA7JTF is his wife).
>
>     Sorry for my english.
>
>
> El 11/12/2011 17:23, Jim Bayer escribió:
>> I'm wondering if there is ISP address munging here.  Perhaps many public
>> addresses are aggregated at the border of an ISP (not country) and it 
>> makes
>> it look like all the requests are coming from the same address.  Like 
>> a PAT
>> address (Public Address Translation) on a grander scale.
>>
>> Just a thought...
>>
>>
>> '73
>> Jim  - KC9AOP
>>
>>
>

-- 
Philip Gladstone
Ham: N1DQ