Network Security - Need a recommendation

Hi there!
I'm currently running a wireless network in my apartment that is passworded on a regular bare bones LinkSys router. Currently I have both my PC desktop and my MBPro on this network. Both are running just fine.
What I am concerned about is people in the apartment complex using my network. I know I could bump up the security on my router but what I really want is a program that lets me A) see the IP's of people connecting to my network, if any, and B) single them out and block them. I have no idea whether such a program exists for Leopard. I'm actually fairly computer-savvy, but network security is a new arena for me.
I'm just wondering if anyone could recommend a program to use that is only moderately complex. Also, I'm willing to pay money, but free is always better. Or any other information would be great, e.g. if the MBP already has the propensity for this type of activity on its own. I know it does a great many things .
Thanks for any help!
Message was edited by: demosthenes_

demosthenes_ wrote:
A) see the IP's of people connecting to my network, if any
Your router should provide this via the web based administration interface.
B) single them out and block them
In stead of monitoring the router for rogue connections, you could setup your Linksys router to perform MAC address filtering. MAC Address filtering involves setting up a whitelist of MAC addresses that can connect to the router and any MAC address that isn't in the list you can explicitly deny access.
What you would need to do is to add the MAC address for each device you have that you want to connect to the network.
To be honest though, if you're at all concerned about the security of your data, http traffic, if you do any online banking, shopping etc you should really enable the encryption features of your router. With the way you have things setup at the moment, even with MAC Address filtering enabled your wireless connection can still be snooped on which means your passwords, account numbers etc are potentially travelling in the clear over the airwaves.
Personally I would just configure the router to use the highest encryption level that all your computers can support and secure the Wireless network with a 10+ digit authentication key (utilising alphanumeric, punctuation and number characters). Doing this will ensure that your network is secure and minimise the risk of someone getting hold of any sensitive data.

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Message was edited by: Chessire

I realized the other day that my IP doesn't match the one given back to me by websites; as I understand it, this might mean that my network security has been compromised.
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