Option 82 DHCP Snooping + Freeradius auth of DHCP requests

Alan DeKok aland at deployingradius.com
Wed Nov 24 13:43:42 CET 2010

Denis Iskandarov wrote:
> Hello!
> I'm trying to setup network with DHCP Snooping Option 82 functionality
> + Freeradius auth for DHCP requests.
> DHCP server which receives DHCP packets from cisco switch "dhcp relay"
> is Mikrotik RouterBoard.
> freeradius2-2.1.7-7.el5. Also updated dictionary from new 2.1.10 package

  Uh... why?  The dictionaries are strongly tied to specific revisions
of the software.

  If you're going to use the 2.1.10 dictionaries, you should use the
2.1.10 software, too.

> "Option 82" works perfectly without radius simply giving IPs to all requests.
> Mikrotik RB sends Option 82 request to freeradius with Redback vendor
> attributes.
> Also i've working eap-ttls and sql auth on same Freeradius server. But
> for simplicity i tried to used "files" auth method,
> which i think should work simultaniously depending on where user name
> where found and to which methods it applies.

  I have no idea what that means, or what that has to do with DHCP.

> Please correct me if i'm wrong. I can't see files method in debug, by
> the way it says that it can't find auth method for username O_O :(.
> I don't know what to do else. Freeradius should receive Username
> Remote and Circuit IT and send Request-Accept with framed-ip from
> mikrotiks dhcp pool

  That makes no sense.  Please use the *correct* names for terminology,
and describe what you want in detail.

  Alan DeKok.

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