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Securing a WLAN

 
 
Dani Camps
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      02-23-2005, 12:54 PM
I have a LAN with a Linux box being the gateway, then I have an AP
connected to an ethernet interface in the gateway and the WLAN. What I
want is to secure the WLAN using OpenVPN 2.0, to do this I can bridge
in the gateway a tap interface with the ethernet interface and then
use iptables to allow only the traffic coming from the tap interface,
then all the traffic that is not VPN will be rejected.

But I have a problem and is that one of my WLAN clients has Windows ME
installed and I can't install Windows XP or Linux in it, it's a
problem because OpenVPN can not be installed in WindowsME. Then I need
a way to allow this machine but without breaking the security of the
WLAN, so making impossible for not authorized clients to access the
WLAN. I have the iptables in the gateway not in the AP, so I don't
know if I can filter by wlan client MAC address there, and anyway the
MAC address filtering is very easy to break, so any ideas ?

Thanks
 
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Frank Sweetser
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      02-23-2005, 01:34 PM
Dani Camps <(E-Mail Removed)> wrote:
> I have a LAN with a Linux box being the gateway, then I have an AP
> connected to an ethernet interface in the gateway and the WLAN. What I
> want is to secure the WLAN using OpenVPN 2.0, to do this I can bridge
> in the gateway a tap interface with the ethernet interface and then
> use iptables to allow only the traffic coming from the tap interface,
> then all the traffic that is not VPN will be rejected.
>
> But I have a problem and is that one of my WLAN clients has Windows ME
> installed and I can't install Windows XP or Linux in it, it's a
> problem because OpenVPN can not be installed in WindowsME. Then I need
> a way to allow this machine but without breaking the security of the
> WLAN, so making impossible for not authorized clients to access the
> WLAN. I have the iptables in the gateway not in the AP, so I don't
> know if I can filter by wlan client MAC address there, and anyway the
> MAC address filtering is very easy to break, so any ideas ?


By limiting yourself to WinME, you've pretty much guaranteed that there is *no*
way to adequately secure it without buying 3rd party software. Your best bet
would be to purchase a 3rd party WPA suplicant, such as the funk or aegis
client, and use WPA encryption (prefereably 802.1x if you can set up a radius
server, or just PSK if not).

Otherwise you're out of luck.

--
Frank Sweetser fs at wpi.edu
WPI Network Engineer
GPG fingerprint = 6174 1257 129E 0D21 D8D4 E8A3 8E39 29E3 E2E8 8CEC
 
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