Is someone hacking my wifi?

[bladder23]

I recently got a wireless network router and on my first computer, the ip was 192.168.1.1

On my second computer, the ip was 192.168.2

A week later, my PDA's IP is 192.168.1.6

My questions

1) Does that mean that 3 other people got on my internet connection.

2) How can I know if they are on my network and who they are?

3) Can they see my internet activity? :S

Thanks for the help AT

 

[BZeto]

Certain dhcp servers hand out IP's differently. Meaning it will not always be in order or sequential (1, 2 ,3 ,4 etc).

Most routers will show you what LAN and wireless clients are connected. Take a look and see if it lists any connected wireless clients that you are unaware of.

Also, if you haven't already, setup wireless encryption with a strong password/key. WEP is the weakest so a variant of WPA is what you want.

 

[JackMDS]

A 1. It means nothing.

A 2.Most Router has a menu that shows how many devices are connected.

A 2. Even if there are Intruders tere is no countable way to ID them.

A 4. If your Wireless is Not secure, sure, people can sniff and see your activities.

From the weakest to the strongest, Wireless security capacity is.

No Security

MAC______(Band Aid if nothing else is available).

WEP64____(Easy, to "Brake" by knowledgeable people).

WEP128___(Hard, but possible to Brake).

WPA-PSK__(Very Hard to Brake ).

WPA-AES__(Not functionally Breakable)

WPA2____ (Not functionally Breakable).

The documentation of your Wireless devices (Wireless Router, and Wireless Computer's Card) should state the type of security that is available with your Wireless hardware.

All devices MUST be set to the same security level using the same pass phrase.

Therefore the security must be set according what ever is the best possible of one of the Wireless devices.

I.e. even if most of your system might be capable to be configured to the max. with WPA2, but one device is only capable to be configured to max . of WEP, to whole system must be configured to WEP.

If you need more good security and one device (like a Wireless card that can do WEP only) is holding better security for the whole Network, replace the device with a better one.

Wireless Security - http://www.ezlan.net/Wireless_Security.html

 

[acole1]

If you want to see how weak WEP is, just read this article.

Also, the article linked above is a bit outdated.

From the article above...
(the key they are talking about is a 128bit WEP key)

It took airodump-ng under a minute to capture the 38,721 IVs and aircrack-ng 0.9.1 under a minute more to find the key. Aircrack actually found the key almost instantly after startup once it had enough IVs. The 55 seconds shown in Figure 12 came from starting aircrack-ng after only around 5,000 IVs had been captured.