Re: How to activate MAC address randomization?

[Thomas Haller <thaller redhat com>]

On Wed, 2016-05-18 at 01:36 +0200, poma wrote:
> On 16.05.2016 23:07, Chris Laprise wrote:
> > On 05/16/2016 12:03 PM, poma wrote:
> > > On 13.05.2016 00:16, Dan Williams wrote:
> > > > On Fri, 2016-04-29 at 16:09 -0400, Chris Laprise wrote:
> > > > > Hi,
> > > > >
> > > > > I just installed NetworkManager 1.2 in fedora 23 in the hopes
> > > > > that I
> > > > > can
> > > > > get mac randomization working. Only problem is there's no
> > > > > sign of a
> > > > > setting for this in nmcli or the applet. I found a reference
> > > > > to a
> > > > > setting on the NetworkManager.conf manpage which states:
> > > > >
> > > > >          wifi.mac-address-randomization
> > > > >              If left unspecified, MAC address randomization
> > > > > is
> > > > > disabled.
> > > > wpa_supplicant only gained the necessary functionality that
> > > > NetworkManager looks for back in late October 2015.  It was
> > > > committed
> > > > after wpa_supplicant 2.5 but it appears there hasn't been a
> > > > release
> > > > since then.  But once that happens, or if you build supplicant
> > > > version
> > > > from git, NM will begin to use that capability if you've enable
> > > > it in
> > > > the NM configuration.
> > > >
> > > > http://w1.fi/cgit/hostap/commit/?id=e50c50d5a090a6a52af6d92ee3a
> > > > 3c9cc37743747
> > > >
> > > > Dan
> > > dbus: Expose interface globals via D-Bus properties - 2.5
> > > backport
> > > https://bugzilla.redhat.com/show_bug.cgi?id=1336495
> > >
> > > Professor, your patch your move ;)
> > LOL, that's great. I hope this means the feature could land in
> > Fedora 
> > 24, which has wpas 2.5.
> >
> > Chris
> # grep rand /etc/NetworkManager/NetworkManager.conf 
> wifi.mac-address-randomization=2

the value 2 here means ALWAYS:

typedef enum {
»···NM_SETTING_MAC_RANDOMIZATION_DEFAULT = 0,
»···NM_SETTING_MAC_RANDOMIZATION_NEVER = 1,
»···NM_SETTING_MAC_RANDOMIZATION_ALWAYS = 2,
} NMSettingMacRandomization;

> # nmcli connection show WiFiRd | grep rand
> 802-11-wireless.mac-address-randomization:default

correct, so it is allowed to fallback to the global configuration
above.




> # journalctl -o cat -b -u NetworkManager | grep random
> NetworkManager[2081]: <info>  [...] sup-iface[[...],wlp0s2f1u3]:
> config: set MAC randomization to 1

here NM logs the value for the supplicant, that is supplicant's
"MacAddr" property, it is either 0 (no-rand) or 1 (randomization).

This is not the numeric value 2 (from NMSettingMacRandomization).


So, above is correct and as expected (albeit confusing).


> The problem is that "rand-mac" does not work,
> tested with patched 2.5 and 2.6-devel,
> mt7601u and rt2800usb driven devices.

Why do you say that "rand-mac" does not work?



Thomas

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