reuse EAP-TLS client certificiate

Arran Cudbard-Bell a.cudbardb at
Wed Sep 9 18:38:26 CEST 2015

> On 9 Sep 2015, at 16:51, Matthew Newton <mcn4 at> wrote:
> On Wed, Sep 09, 2015 at 10:43:34AM -0500, Matt Zagrabelny wrote:
>> With EAP-TLS, can one reuse the same client cert across multiple devices?
>> I'm guessing "yes", but would appreciate confirmation.
> Yes, FR doesn't care about where the certificate from, only that
> it's valid.
> But then when you need to remove one client from the network, you
> revoke its certificate and...
> no, it's not a good idea for several reasons.
>> Tangentially, is there a way to "pin" a certificate to a client's MAC address?
> Yes, with grand illusions of security that don't exist. Until a
> recent O/S comes along and starts using random MAC addresses, that
> is.

Ahhh every time I read about it, I start clapping gleefully and making te-he-he noises.

Arran Cudbard-Bell <a.cudbardb at>
FreeRADIUS development team

FD31 3077 42EC 7FCD 32FE 5EE2 56CF 27F9 30A8 CAA2

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