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iOS 14 introduces private addresses

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#1 40H3X

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Posted 3 October 2020 - 17:01

Very annoying when you use reservations on mac address and iOS suddenly undermines this by introducing this new feature.


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Re: iOS 14 introduces private addresses #2 betacentauri

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Posted 3 October 2020 - 17:07

Afaik you can deactivate it for every wlan.
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Re: iOS 14 introduces private addresses #3 WanWizard

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Posted 3 October 2020 - 17:08

What are those? Random MAC adresses?


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Re: iOS 14 introduces private addresses #4 40H3X

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Posted 3 October 2020 - 17:47

Afaik you can deactivate it for every wlan.

Did that already, the annoying thing is that I stumbled over it by accident.Then I checked the dhcp leases and noticed all iOS devices had new ip addresses as I was sure all where reserved on mac. Then noticed they all had new mac addressen and was flabbergasted :o


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Re: iOS 14 introduces private addresses #5 40H3X

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Posted 3 October 2020 - 17:47

What are those? Random MAC adresses?

Yes to enhance privacy

 

edit: https://support.appl.../en-us/HT211227


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Re: iOS 14 introduces private addresses #6 WanWizard

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Posted 3 October 2020 - 17:57

Which idiot come up with that?

 

From what I read, it is still a static MAC address, but per SSID. So BOOTP should still work within that SSID, on the private MAC for that SSID?


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Re: iOS 14 introduces private addresses #7 WanWizard

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Posted 3 October 2020 - 18:00

Ah, no, another doc says it changes once per 24 hours.

 

That means organisations using 802.1x MAC authentication will have a major headache on their hands... That includes all public hotspots that require authentication (like hotels, coffeeshops, etc).


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Re: iOS 14 introduces private addresses #8 40H3X

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Posted 3 October 2020 - 18:10

Which idiot come up with that?

 

From what I read, it is still a static MAC address, but per SSID. So BOOTP should still work within that SSID, on the private MAC for that SSID?

...just that an idiot :D could only have come up with this. I ended this $&@#@! b*llsh*t feature by enabling "Deny unknown clients". Anyone who cannot access internet will squeal ;) , but you are right lots of headaches and people using up there bandwidth as they can't connect.


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Re: iOS 14 introduces private addresses #9 40H3X

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Posted 3 October 2020 - 18:16

Here is the link https://support.appl.../en-us/HT211227


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Re: iOS 14 introduces private addresses #10 40H3X

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Posted 3 October 2020 - 19:49

Also for Android https://source.andro...c-randomization


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Re: iOS 14 introduces private addresses #11 Erik Slagter

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Posted 4 October 2020 - 09:15

Yep, newest Android has it too. I have to manually select "static mac address" for every SSID I connect to. Worthless.

 

It's even worse, but not many people noticed, apparently: for IPv6 addresses, Android only supports SLAAC addressses and it has "privacy extensions" always enabled (you cannot disable it). This means your IPv6 (host part) is completely random and changes every few hours.

 

I had to workaround it by always using a VPN tunnel (OpenVPN) even when at home. Now I have always predictable and the same IPv4 and IPv6 addresses, when at home or outside. Inside the house I have them connect to a special SSID that only allows traffic to the outside OpenVPN ip address+port so Android is always complaing (using a ! next to the WLAN sign) but it just works. And in that SSID it doesn't matter what mac address is used (-> random IP) as long as the passphrase is correct.

 

So I am using a "privacy mechanism" to fight a "privacy mechanism".

 

Now I can implement measurements to turn off internet access for my son's tablet after 19:00, which would otherwise be impossible (combined with actual working IPv6).


Edited by Erik Slagter, 4 October 2020 - 09:17.

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Re: iOS 14 introduces private addresses #12 40H3X

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Posted 4 October 2020 - 11:53

The most baffling to me is that it is enabled in iOS 14 by default, they could have at least warned users that this feature is there. Better the user should have at least been asked if they want new MAC addresses for existing networks (creates one for every SSID).

 

So I came across or rather stumbled over it. I use FW rules with aliases (IP and Ports) in combination with a daemon that listens for broadcast or multicast packets on a specified UDP port and then relays the packets to other specified interfaces. This way I can access Sonos devices that are in another VLAN than the apps and suddenly I lost access to them...


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Re: iOS 14 introduces private addresses #13 Erik Slagter

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Posted 4 October 2020 - 15:39

On Android it's on by default as well.

 

For this reason I have turned off dynamic DHCP off completely, only static entries. This means that if a client tries to connect with an unknown, possibly randomised, mac address, you'll notice immediately because you won't get an ip address, instead of having weird behaviour.


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Re: iOS 14 introduces private addresses #14 40H3X

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Posted 4 October 2020 - 16:52

Here quit the same only the clients defined will get DHCP leases from the server as unknown clients are denied. IMHO this feature would be better opt-in than opt-out.


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Re: iOS 14 introduces private addresses #15 Erik Slagter

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Posted 8 October 2020 - 17:05

Yeah, often options are default in a way that needs least thinking for the user, but that's not always the "best" option (like this one).


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