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Old 13. Jan 2013, 11:01 PM   #1 (permalink)
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Default Web security with IPv6 enabled

If IPv6 is enabled in the computer, does it compromise anonymity on the internet?

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Old 14. Jan 2013, 04:20 AM   #2 (permalink)
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I don't see how it'll expose you further, unless you use proxies, VPN's, and the like that don't support IPv6.

On the other hand, having both IPv6 and IPv4 enabled may increase attack surface area (more ways to detect and hack you), so you probably should only keep one enabled.
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Old 14. Jan 2013, 01:16 PM   #3 (permalink)
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I have been seeing this question come up a lot lately. My guess is that it has to do with the MAC address of the computer being included in the IPv6.

My understanding is that Windows (since XP SP2) has, enabled at default, privacy addressing to hide your IP from IPv6.
http://blog.superuser.com/2011/02/11...ow-to-stop-it/

I am not sure what the status of Apple and Linux is on this. The above article is from 2 years ago and then Linux & Apple users had to enable privacy addressing. Not sure what the status is now.

You can see your IPv6 address here:
http://ipv6-test.com/

Info on seeing your MAC address:
http://wintelguy.com/2009/20090215_find_mac.html

I checked mine recently (Windows 7) and my MAC was not in the IPv6.
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Old 14. Jan 2013, 05:41 PM   #4 (permalink)
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I read a most interesting article about IPv6 in Torrent Freak. It is to do with using VPN for BitTorrent. Apparently this flaw in IPv6 applies to non-BitTorrent traffic as well. The article itself is dated, June 17th 2010. I am not sure whether I am allowed to post the link to it. Therefore I am copying some relevant extracts here:

"At the Telecomix Cipher conference a security flaw was revealed that allows third parties to find the true IP-address of someone connected through a VPN"

"The security risk is caused by a lethal combination of IPv6 and PPTP-based VPN services, which are very common. IPv6 is the Internet protocol that will succeed IPv4. The protocol is promoted by Windows 7 and Vista, among others, and most people are using it without even realizing it"

"The technical details of the vulnerability, explained in this talk (see below), reveal that the true IP-address of users using IPv6 can be easily traced"

"The vulnerability is not limited to BitTorrent either. It can expose people who believe that they are hiding their real IP-address through nearly every connection"


If a moderator can clear me to post the link here to the full article, I can do so. There is a video also on this page where the above Telecomix Cipher conference is shown live, and their technical explanation can be listened to. Information of considerable interest is to be found in this video.

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Last edited by Melita-s; 14. Jan 2013 at 05:47 PM. Reason: To add content
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Old 14. Jan 2013, 06:29 PM   #5 (permalink)
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Yes, please do post the link. If you post an extract from any site, or somewhere, please post a link to the page from where you got it.
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Old 14. Jan 2013, 06:39 PM   #6 (permalink)
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Thank you. Here is the link:

http://torrentfreak.com/huge-securit...orrent-100617/
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Old 15. Jan 2013, 08:24 PM   #7 (permalink)
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IPv6 discussion has now shifted to my other thread in this same section, under the title "My real IP is being displayed in-spite of using VPN"

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