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Suggestions for network security that sits behind my router


postdiction
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Here is my current net map:

server
|
>>>>>>>>>>>>>>>>>>>internets----->cable modem --->wireless router ---> workstation

I have an older laptop that I want to use for security purposes, I want it to sit there monitoring network traffic looking for spyway/intrusions etc....

Here is what it should look like:

server
|
>>>>>>>>>>>>>>>>>>>>internets----->cable modem --->wireless router ---> workstation

|
old lappy

I plan on running debian or ubuntu server and will add any firewall/ids system as needed. I plan on running this old laptop as command line only so should have a web/command line interface.

As always, a free app is better.

thanks for the help.

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VaKo hit it on the head. I'd rather mirror ports, but building a tap isn't that difficult. If a comlete n00b like me can build one, anyone can.

It can be worth it. Although I would not recommend Snort per-say. The newest version of Snort (bless sourceforge goodness) is rather interesting to install/configure. If you want quick and easy, jump over and grab EasyIDS. Super simple to set up and you can attach Aanval for streaming it live on a second or third monitor. It doesn't take a heavy trodden hardware beast to run it either.

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VaKo hit it on the head. I'd rather mirror ports, but building a tap isn't that difficult. If a comlete n00b like me can build one, anyone can.

It can be worth it. Although I would not recommend Snort per-say. The newest version of Snort (bless sourceforge goodness) is rather interesting to install/configure. If you want quick and easy, jump over and grab EasyIDS. Super simple to set up and you can attach Aanval for streaming it live on a second or third monitor. It doesn't take a heavy trodden hardware beast to run it either.

So.... I also want this server to be setup for openvpn for when I occasional will need to vpn into my server. If I install snort or easyIDS will I need to dedicate a nic to it? I can put up to 3 nics in the laptop but, currently, I only have 2. How many nics would I need to set up both openvpn and (snort|easyIDS)?

Also, can snort|easyIDS be administered via a web interface?

Thanks

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Not sure, but traditional logic states that you'll need 3 interfaces for this setup - 1 internal to reach the server, 1 external for your vpn, and 1 for passive monitoring. When you're monitoring, you cant also be transmitting, so that eliminates your ability to use one interface for two purposes.

The smarter people here will correct me I'm sure :).

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