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Randomize your WiFi MAC address on Ubuntu

paulfurley.com

51–60 of 108 posts

Re: Randomize your WiFi MAC address on Ubuntu

#51
post #30

NSA MAC address prefix is 00:20:91, you can combine this knowledge with the one from the article to scare your sysadmins.

This threw me for a minute. The NSA is not what I would consider an ethernet vendor. But it's true: https://news.ycombinator.com/item?id=11792320

Re: Randomize your WiFi MAC address on Ubuntu

#52
Where would MAC address capture occur on the network? MACs are local to L2 traffic, so once a frame turns into a packet and is routed, the sMAC of your PC is no longer present in the data. If you're on your home network, this has no impact what so ever.

Re: Randomize your WiFi MAC address on Ubuntu

#53
post #47
post #44

Earlier quoted context omitted.

Can you show me where changing your MAC address is illegal?

It's not illegal, it can be detected and then used against you in an indictment. It's like saying you dislike someone, they go missing, and the prosecutor mentions what you said.

"can be detected" beyond regular ol' OS/Browser/Traffic/Activity fingerprinting?

Re: Randomize your WiFi MAC address on Ubuntu

#56

Your router MAC address is tracked by Google Location services. They do this with their wardriving vehicles and from Android phones.

Yes and even if you changed your Mac every day, your neighbors probably wouldn’t. So google can still see the three routers around you, look up the gps those routers have been seen concurrently with, and know where you are.

Re: Randomize your WiFi MAC address on Ubuntu

#57
It’s worth noting that iOS has randomized MAC addresses in WiFi probes since iOS 8.[1] As far as I know your real MAC address is exposed upon connection. I’m curious to what extent other vendors have implemented this strategy.

[1] https://arstechnica.com/gadgets/2014/06/ios8-to-stymie-track...

Re: Randomize your WiFi MAC address on Ubuntu

#58

Here is the code I use for my mac to randomize my mac address: interface="en0" new_mac=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/:$//; s/./0/2') # from stackoverflow sudo ifconfig $interface ether $new_mac Edit: What's the advantage of the solution in the post? If I just change my mac address every time I join a network (even the same one), they can't track me with my randomized mac addresses. So why would I pre…

Some bits of the MAC address are significant. You're generating all 48 bits randomly which could have some side effects.

Re: Randomize your WiFi MAC address on Ubuntu

#59
post #52

Where would MAC address capture occur on the network? MACs are local to L2 traffic, so once a frame turns into a packet and is routed, the sMAC of your PC is no longer present in the data. If you're on your home network, this has no impact what so ever.

The capture would occur inside the router. You can just dump its ARP table which translates between MAC and IP address.

"If you're on your home network, this has no impact what so ever." Yes, I'm fairly happy with my own tracking policies :D

Re: Randomize your WiFi MAC address on Ubuntu

#60
Note that your MAC address is only one part of the identifying information your computer gives to the DHCP server. For another approach check out DHCPcAnon:

https://github.com/juga0/dhcpcanon

You can contribute to the development of this project by helping to integrate it with your favorite WiFi manager.

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