Is someone using my wireless?

I don't know if its just me being paranoid but I think someone is using my wireless. I started getting times where the internet slows down a LOT. So I did some research and it said to check something called the DHCP Table. When I go into DHCP Client Table. My usual devices show up but then I get an IP named '(none)' on it and the other day there was an 'Unknown' on it. My security is on WPA2-Personal. It is a Linksys router. I really think its some stupid kid thinking he's cool by hacking it. Any suggestions?

Change your WPA2 password to a different, stronger one and read this.

Thank you. I have changed it to a 12 character password using a password generator. We will see what happens.

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Originally Posted by Elvenmunky

We will see what happens.

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it takes up to 5114 years to crack 12 char only lowercase password
1444817999 years to crack 12 char upper/lower/digit/punctiation password

If it happens again, I would suspect friends and relatives. Check for keyloggers.

To crack wpa they need to catch the package called "4-way handshake". Everytime you connect to wifi this 4way handshake occurs between you and wifi access point. Attacker need to catch this to perform a crack. The reason I'm telling this is, most common way of getting this key package is forcing existing connection to fail. When you connection fails your auto-reconnect reconnects which leads to creation of a new 4way-shake. Keep and eye on mysterious disconnections

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Originally Posted by Expeto

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Originally Posted by Elvenmunky

We will see what happens.

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it takes up to 5114 years to crack 12 char only lowercase password
1444817999 years to crack 12 char upper/lower/digit/punctiation password

If it happens again, I would suspect friends and relatives. Check for keyloggers.

To crack wpa they need to catch the package called "4-way handshake". Everytime you connect to wifi this 4way handshake occurs between you and wifi access point. Attacker need to catch this to perform a crack. The reason I'm telling this is, most common way of getting this key package is forcing existing connection to fail. When you connection fails your auto-reconnect reconnects which leads to creation of a new 4way-shake. Keep and eye on mysterious disconnections

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Thank you for your reply. I used to have serious mad disconnections before. My whole computer used to act weird when it disconnected. It used to freeze my computer every-time I had a disconnection. It is not so bad now. I had cheeked the DHCP table again and the '(none) and 'Unknown' were back again. Does the DHCP log wired connections as well? Because I believe it could be my Xbox and PS3.

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Originally Posted by Expeto

it takes up to 5114 years to crack 12 char only lowercase password
1444817999 years to crack 12 char upper/lower/digit/punctiation password

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What if they use cloud cracking services? For a small fee they put an array of powerful servers to work on your captured WPA handshakes. One of them claims it can break most passwords in 20 minutes or less.

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Originally Posted by Elvenmunky

Does the DHCP log wired connections as well?

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Check the manual or Google your router's model number, it should say so somewhere.

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Originally Posted by Elvenmunky

Thank you for your reply. I used to have serious mad disconnections before. My whole computer used to act weird when it disconnected. It used to freeze my computer every-time I had a disconnection.

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That is a nicely done de-auth by your hacker. He basicly send bogus signals about that your connection is broken. Its bit like phishing emails, but ofcourse these are wi-fi packages instead of mails.

Do some trial and error to see if its really your ps3 or xbox, but I don't think both ps3 and xbox will be unknown.

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Originally Posted by anon-sbi

What if they use cloud cracking services? For a small fee they put an array of powerful servers to work on your captured WPA handshakes. One of them claims it can break most passwords in 20 minutes or less.

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I think leaving thy neighbour alone might be cheaper :) If the hacker happens to have access to either a data center or a slave botnet you password might not stand a chance. But still we are talking about a nice 12 char password if its upper/lower/digit/punctiation, it will still take to 1734 years even if 999999 average computers works on it at the same time.

ofcourse... this was before the cloud (fuck you google!, fuck you for making it popular)
If read a german guy cracked a PSK in 6 mins(I don't know how many chars or how good was the password) with amazon cloud and the amazon charged him less than 10$ for that cpu usage. He was supposed the release the software a conference this year

You can probably see a log of the connections to your router via its admin interface, if you see nothing unusual it may be a virus/trojan.. that's not too uncommon in the file sharing world ;)

how do i check the log connections on the router.
IF I am using someone's wifi signal and downloading,will the owner of the connection know that i am using
If i do manage to get his wifi can i log into his system if so can anyone explain.

The owner may see that someone is using their wifi. Now if your pc name is "raghuveer-Pc" it may give him a hint about who it is ;) If you're connected to his wifi you can see the files he is sharing on his computers and things like that.. Basically you're connected to his "private" lan.