[Bug 176125] Re: Ubuntu should activate the IPv6 privacy extension by default (echo 2 >/proc/sys/net/ipv6/conf/all/use_tempaddr)

[Allo]

@Michael Heimann
yeah, the idea IS to have a workaround for ssh, and only for it (or some other server-software).

with tempaddr = 2 you have a dynamic and a static ip, and softwares are
using the dynamic by default, if not configured otherwise.

You can surf (more) anonymously, but your ssh-session uses the static
ip, so the session does not die when the tempaddr is discarded. It
should be a user decision to use the static ip, the default should be
safe for the average user, which means that he's not exposed by a static
ip.

Server software will bind to all intefaces by default, so a http or ssh
server will be reachable on the dynamic address (mostly useless for you)
and the static address (useful). Client software which needs long
sessions often can be configured to use a specific from-ip, as i showed
you the manual for the ssh-client.

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https://bugs.launchpad.net/bugs/176125

Title:
  Ubuntu should activate the IPv6 privacy extension by default (echo 2
  >/proc/sys/net/ipv6/conf/all/use_tempaddr)

Status in “network-manager” package in Ubuntu:
  Confirmed
Status in “procps” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: procps

  Some background information:
  recently "Free ADSL", one of the biggest ISP in France, added IPv6 support possibly exposing 2.5 millions of users to IPv6

  The address are configured automatically and by default linux will build it using the MAC address. However this presents a risk of privacy loss:
  - there is an unique identifier which can be used by website to track the location of a laptop or pda
  - some information about the model of the network card (other information can be probably derived if you know the serial number of the card) is leaked

  The following rfc (http://tools.ietf.org/html/draft-ietf-ipngwg-temp-
  addresses-v2-00) mitigitates this problems by introducing temporary
  addresses to be used by outgoing connection (in addition to the static
  address which can be used for incoming connection and have a dns name
  associated with it).

  To activate it under linux you just need to activate the following in sysctl:
  echo 2 >/proc/sys/net/ipv6/conf/all/use_tempaddr
  or add "net.ipv6.conf.all.use_tempaddr=2"

  thanks for protecting the privacy of the clueless users by default :)

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