Re: Does the laptop NIC MAC address ever get past your home broadband router?

From	Pascal Hambourg <boite-a-spam@plouf.fr.eu.org>
Newsgroups	alt.internet.wireless, alt.os.linux
Subject	Re: Does the laptop NIC MAC address ever get past your home broadband router?
Date	2015-06-04 21:38 +0200
Organization	Plouf !
Message-ID	<mkq9ff$2efq$1@saria.nerim.net> (permalink)
References	<a41f0$55641de5$32a2521d$12641@nntpswitch.blueworldhosting.com> <wwvmw0ro7xq.fsf@l1AntVDjLrnP7Td3DQJ8ynzIq3lJMueXf87AxnpFoA.invalid> <286a6$556fe0bd$4ad0de13$11449@nntpswitch.blueworldhosting.com>

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Hello,

Will Dockery a écrit :
> On Tue, 26 May 2015 13:10:57 +0100, Richard Kettlewell wrote:
> 
>> In IPv4, the answer is 'no'.  IP packets don't contain MAC addresses.
> 
> That's what I thought. So only a hotel or Starbucks would know what
> your MAC address is, but, at home, the ISP doesn't know your MAC address, 
> right?

It does if it provides and owns "your" broadband router.

>> In IPv6, one of the address assignment mechanisms derives the address
>> from the MAC.  
> 
> Yikes! That's bad. Very bad. That means that you're unique, even though
> you may be on various IP addresses! 

That's neither good or bad. It has advantages and disadvantages.
If you don't like it, you might be interested in setting
/proc/sys/net/ipv6/conf/$INTERFACE/use_tempaddr to a value above 1.

<https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt>

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Re: Does the laptop NIC MAC address ever get past your home  broadband router? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-06-04 21:38 +0200
  Re: privacy, hah!, was: Does the laptop NIC MAC address ever get past your home broadband router? "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2015-06-04 18:34 -0400
    Re: privacy, hah!, was: Does the laptop NIC MAC address ever get past your home broadband router? Eli the Bearded <*@eli.users.panix.com> - 2015-06-04 23:05 +0000
  Re: privacy, hah!, was: Does the laptop NIC MAC address ever get past your home broadband router? J0HNS0N <12J0HNSON122@2300nomail.com> - 2015-06-04 19:21 -0700
    Re: privacy, hah!, was: Does the laptop NIC MAC address ever get past your home broadband router? danny burstein <dannyb@panix.com> - 2015-06-05 02:32 +0000

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