wireless help

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BTex

Thread Starter
Joined
May 10, 2002
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564
at my wifes office they have a cable modem with a wireless ap
and it is used just for wireless nitebooks intenet

now they want some security and a server to store files that have to do with the $ and other file and print sharing?

any advice??

and how do i find the IP of the cable modem?
 
Joined
Jul 18, 2001
Messages
2,910
To find the ip address of the cable modem have someone from within the network browse to this address and click the button.
http://www.dslreports.com/whois

as for security on the wireless I would just enable mac address filtering and then add the mac address to the allow list on the AP and deny anyone else. Thats the most secure way to do it in my opinion.
 

JohnWill

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Joined
Oct 19, 2002
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106,425
Actually, MAC filtering is not secure at all. I can spoof the MAC address and log onto a wireless network with MAC filtering in seconds. All that's required is to monitor traffic until you have collected the MAC address(es), and wait for that person to be off-line and use their MAC address.

There is no absolute security for wireless 802.11a/b/g at this point. Your best bet is to use 256bit WEP and rotate the keys regularly. It takes several gigabytes of transfers to crack the 128 bit WEP keys with commonly available cracking software, I don't know how much better the 256bit key is, but it's also crackable. Of course, turning off SSID broadcasting and using MAC filtering will add a couple more hoops to jump through, so I'd probably use them all. :)
 
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2,910
Doh, I knew you could spoof a mac, just didn't think about how they could get a mac with access to the router, didn't think about capturing traffic and extracting the mac from there. Thanks John. :)
 

JohnWill

Retired Moderator
Joined
Oct 19, 2002
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I've just been through all of this for a client, trying to convince him that it's not bulletproof. It was quite illuminating for him to be presented with articles on cracking WEP and websites where you could download the automated tools! :eek: He's a believer. :D
 
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