Fri, 17 May 2013 08:05:29 -0700
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Do you encrypt your wireless? WEP isn't sufficient to prevent a determined attacker from decrypting your traffic (sensitive communications should be using HTTPS, even if wireless encryption is also used...), but it *does* require a PSK (Pre-Shared Key -- i.e., a password) to join the network. (The TrueCrypt I've heard of encrypts the data on a drive, but does nothing to secure it in transmission (and so isn't relevant for this), but there might be an Australian product using that name that does something different. Your wireless router should be able to show you a list of currently connected clients, with at least the wireless MAC address of each and perhaps additional information such as signal strength, traffic volume, etc. It shouldn't be too difficult to identify your devices on this list and see what that leaves. If you have a small laptop (I use a netbook for this), you may be able to use software such as NetStumbler or InSSIDer to search for devices associating to your SSID and track them down by seeing how their signal strength changes as you move in different directions. (Note that this may bring you face-to-face with the responsible party....) I used to use NetStumbler for this, but it seems that lately my devices have wireless chips in them that NS hasn't been updated to support. InSSIDer appears to take a less low-level approach and so be more hardware-independent -- it's from the makers of the "Wi-Spy" USB spectrum analyzer, which can be helpful in tracking down interference from non-wifi sources. You could also consider switching to 802.11a, which uses the 5GHz band instead of 2.4GHz. 'a' gear tends to be a bit more expensive and a bit more power-hungry, but only devices with a 5GHz radio will even see it, and that probably won't include your "leech". David Gillett CISSP CCNP -------- Original Message -------- From: Robert <[log in to unmask]> I have for a long time had suspicions that somebody is logging in to my home Wifi network and using my download allowance. I have used all the appropriate settings in the router and use Truecrypt to avoid anybody accessing my private information, banking details, passwords etc. I am looking for any software which could tell me if outsiders have found a way to use my internet connection. I have a D-link router with 2 wireless PC connections and one usb connection. Any suggestions ?? Bob Weaver The NOSPIN Group is now offering Free PC Tech support at our website: http://freepctech.com |
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