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Off late, I am seeing a number of IP addresses starting with 10.x.x.x in my bittorrent peer list. Aren't these IP addresses supposed to be private ones? I don't understand how I am able to see the IP address instead of the WAN (external IP) of the client... Any one knows why?


traceroute to (, 30 hops max, 60 byte packets
 1 (  1.093 ms  0.842 ms  0.775 ms
 2  * * *
 3  * * *
29  * * *
30  * * *
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you should try tracerouting one of them from your machine to see how it's routed. use the tracert command on Windows or traceroute on Linux (maybe OSX too). if you post the output into your question we can explain more specifically; otherwise we'd just be offering a general explanation. – quack quixote Apr 1 '10 at 16:35
Thanks. I did that but thought it might not be very useful.... but in any case, just edited my question with the output. – Legend Apr 1 '10 at 16:39
Someone leeching your wireless and in need of the same files? That's a very small chance... Any idea what addresses your router's DHCP hands out? seems to be an odd address anyhow, if your router starts at (or maybe in your case). – Arjan Apr 1 '10 at 16:54
Or using some TOR client, or some anonymising VPN? – Arjan Apr 1 '10 at 16:55
(And for a quicker response, see How do comment replies work?) – Arjan Apr 2 '10 at 20:07

If you're on some anonymising VPN, then all your outgoing and incoming internet traffic will go through that VPN. And others using that very same VPN will have IP addresses in the same private range. (To the outside world, all these users will share a single public IP address, which is not the IP address as assigned by their ISP.)

(The same might apply to using Tor, but I doubt that.)

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It looks like that address isn't actually working, so you're probably just picking up a stray LAN address from acquired from:

  1. a silly tracker
  2. peer exchange with a peer which doesn't know whether or not you're on the same LAN
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Interesting answer... Would you mind elaborating more on these points? I am pretty sure something like this should not happen and might be happening due to a bug somewhere but am very interested in knowing what might be causing this to happen. For instance, what exactly does silly mean? – Legend Apr 1 '10 at 20:08
Well, by "silly" I mean something like "buggy" or "misconfigured", but in a way that I can't see doing much harm. – SamB Apr 1 '10 at 21:06

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