On Sun, 10 Oct 2004, Josh Howlett wrote:

> On Sun, 10 Oct 2004, Alan DeKok wrote:
>
> > Josh Howlett <[EMAIL PROTECTED]> wrote:
> > > In fact, the returned attributes in the second Access-Accept are the
> > > same as the first (when they should have been different).
> > >
> > > I am speculating here, but it is possible that FR has gotten confused by
> > > the fact that each Access-Request bears the same source IP:port and ID
> > > field, and is returning a duplicate Access-Accept?
> >
> >   Ah, that's what I suspected.
> >
> >   The NAS is probably re-using the same authentication vector (try
> > tcpdump -x, or ethereal to see it).  In that case, with:
> >
> >   - same ID
> >   - same packet type
> >   - same authentication vector
> >
> >   The server MUST respond with the same reply packet as of a few
> > seconds ago.
>
> What's an 'authentication vector'? Is this the packet authenticator?

Replying to my own mail - the Authenticators are the same in both
packets.

So is this definitely a NAS bug? From my reading of the Authn RFC, the
Authenticator should be unique...

thanks for your help Alan.

josh.

------------------------------------------------------------
Josh Howlett, Networking & Digital Communications,
Information Systems & Computing, University of Bristol, U.K.
'phone: 0117 928 7850 email: [EMAIL PROTECTED]
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