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Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
[quote] Ok so i was going through the DHCP client list in my router webpage, and there was this computer that does not belong to us. It says
192.168.169.2 LeeChehWei-PC 00:1d:e0:80:cd:b1
Now i also checked the IP pool that the router is using.
192.168.169.2 is not in that pool as it only goes from 192.168.2.2 to 192.168.2.100
what is this machine? How did it manage to connect? [/quote1291139448]
Are you encrypting your access point? If not, you should be.
The guy has connected with a class B address - this is possible with some routers, even if their own DHCP pool is a different class altogether - if he intruder sets a static IP and gets lucky, then its your problem. Anything under 192.168.*.* is for "local" use - some routers allow anything in that class B range by default.
If this is a domestic setup, make sure everything is in a specific class C range, in your case 192.168.2.* - the mask needed is then 255.255.255.0 - this should be on every bit of kit on the internal side of your network.
You need to up your encryption - if you already have it encrypted, change the key and up the length, then reset the key in all your clients.
What router do you have?
In my last job, we had a similar thing which turned out to be the night security guard bringing in a laptop to watch dodgy movies - he just looked for a spare CAT5e point and plugged in - I made all ports lock to a specific MAC address after that and set up alarms & honey pots to trap further attempts...
Registered Member #3465
Joined: Tue Nov 30 2010, 08:51PM
Location:
Posts: 1
Don't miss a great opportunity, fire up a sniffer like Snort. Filter the traffic to that IP and see what he is up to! He could be doing something illegal through your public IP!
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
heh. sounds like someone around might be using a cantenna. i agree it probably isn't a good idea to leave the wireless unlocked, in case someone is using it to send spam/download dodgy stuff/etc. For security reasons I recommend getting a printout of the mac address and times connected etc in case this gets ugly.
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Someone is connected to my wireless network
