[Chilli] Thoughts on making Chilli's DHCP network interface aware

Stelio Gouveia stelio at skyrove.com
Mon May 24 08:11:08 UTC 2010

Hi Pieter

Can you make this patch publicly available.

I assume this makes it possible to change the query string parameters
depending on
which wireless network a client is connected to?

- Stelio

On Sun, May 23, 2010 at 11:21 PM, IT-Systemmanagement Pieter Hollants <
pieter at hollants.com> wrote:

> Hi David,
> Am 23.05.2010 06:40, schrieb David Bird:
> > You have all your EAP subscribers on one VLAN with UAM on the other? If
> > so, then that is how you should reliably know which network (EAP/UAM)
> > the user is on. If you are not getting any indication from the EAP NAS
> > about the subscriber disconnect, then I don't see how chilli would
> > otherwise know if that same client came back to UAM. It should work, but
> > as you noted, chilli doesn't really know (because EAP and UAM *can* work
> > together, of course).
> Exactly there was the mistake in my thinking. First of all, I've read
> through IEEE 802.11i and IEEE 802.1x and there simply is no such thing
> as a disconnect indication from the access point to the RADIUS server.
> The AP simply doesn't share its state, so all CoovaChilli can see at any
> time is a request to "open the gate". Which is logical, since both
> standards don't want the RADIUS server (or a proxy such as CoovaChilli)
> to track state.
> Second, I was under the misconception that the two WLANs end up in
> different VLANs, which they actually do not currently -- I explicitly
> routed the EAP VLAN through CoovaChilli as well since I wanted to reuse
> the same IP network independent of the WLAN chosen and it doesn't hurt
> if CoovaChilli implements a "second switch" behind the AP, considering
> it acts as Radiusproxy.
> Now you got me thinking, however. Either use a seperate VLAN for EAP,
> then I'd have to assign a second IP net, or extend CoovaChilli so it can
> do "dhcpif" on two interfaces at once. Running two Chilli instances
> doesn't make much sense in this scenario, I guess.
> > Perhaps what you want is a VLAN based option to not allow logout?
> >
> > I mentioned it before, but I personally think removing the logout
> > ability is one thing, but probably more important is just to remove the
> > LINK to the logout feature for these users. Another idea might be to add
> > a query string parameter indicating a "auth=eap" so your portal can know
> > not to show a logout link...
> In the patch I developed so far I did something similar: I added a
> "allow_logoff" parameter so the portal knows whether it should show a
> link or not. Independently, I also had to consider the case where users
> enter the word "logout" because it's advertised all over the portal. So
> it makes sense to do both: indicate to the portal not to show the link
> but also disable the two ways the user has (http://IP/logout and
> "logout").
> --
> Dipl.-Wirtsch.-Inform. Pieter Hollants
> IT-Systemmanagement Pieter Hollants          Tel. : (+49) (0)6192-910717
> Rossertstraße 80                             Fax  : (+49) (0)6192-910713
> 65830 Kriftel                                eMail: pieter at hollants.com
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