[RADIATOR] EAP Response type 25, but no expected type known - Rogue Access Point?

Ullfig, Roberto Alfredo rullfig at uic.edu
Wed Sep 4 13:06:15 UTC 2019

Yes, mis-spoke, the UDP packets are sent from the wireless controllers - I'm not familiar with the traffic between APs and user devices. This blog at least says that packets could be lost with overlaping WiFi services:


"Outside Interference From Nearby WiFi Networks Negatively Impacts Yours
The signal from nearby wireless networks and access points can impact performance on your network. Access points on the same channel can affect your network performance and cause dropped connections or lost packets while using the internet."

Roberto Ullfig - rullfig at uic.edu
Systems Administrator
Enterprise Architecture and Development | ACCC
University of Illinois - Chicago
From: Heikki Vatiainen <hvn at open.com.au>
Sent: Wednesday, September 4, 2019 7:59 AM
To: Ullfig, Roberto Alfredo <rullfig at uic.edu>; radiator at lists.open.com.au <radiator at lists.open.com.au>
Subject: Re: [RADIATOR] EAP Response type 25, but no expected type known - Rogue Access Point?

On 04/09/2019 15.13, Ullfig, Roberto Alfredo wrote:

> While this might be true:
> "..then the trusted AP would force the end user to start authentication
> from the scratch"
> That user's device is still going to send that UDP packet to the new AP
> and end up on our server no?

It won't be sending UDP directly. See, for example below, for diagrams
and how it the user's device must use EAPOL, not UDP, to send and
receive authentication messages.


I was just thinking about WLAN gear that does not enforce port control
correctly. Most likely these kinds of legimate devices would be
malfunctioning if they pass through messages that do not follow the
expected authentication sequence.

> Also, it doesn't have to be  a rogue AP
> does it, it could be someone else's legitimate AP that just happens to
> be near one of our APs.

I'd still say that correctly functioning APs would not pass any EAP
messages through but would force the end user to start with
EAPOL/EAP-Request/Identity. However, I'm not that familiar ways various
devices work to say exactly what's possible.


Heikki Vatiainen <hvn at open.com.au>

Radiator: the most portable, flexible and configurable RADIUS server
anywhere. SQL, proxy, DBM, files, LDAP, TACACS+, PAM, Active Directory,
DIAMETER etc. Full source on Unix, Windows, MacOSX, Solaris, VMS, etc.
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