How to monitor my shared network connection

Hi,
I have a mac mini server which I'm using (among other things) to share my internet network connection (from the ethernet adapter) with other wireless clients through the wireless adapter. This works fine.
My question is: how do I monitor how many clients are attached to the wireless network?
Thanks!

The answer to your question also depends on whether you want to monitor which of your friends etc. is online, or whether you want to monitor for malicious users/attackers.
In the first case the DHCP client list ist quite ok, in the second case it wouldn't help you: An attacker would probably not query your DHCP server, he would just listen to some traffic and could then (a) choose a seemingly free IP from the network, (b) hijack an existing IP and MAC address (or of course (c) decide to use the DHCP server after all).
You can use tools like TCPDUMP, ETHEREAL or KISMAC to scan the traffic on your WLAN, but since an attacker that has cracked the WEP key could change his MAC address to that of one of the other computers, intrusion detection is difficult. With respect to protection the best advice probably is the one about using more secure methods than WEP...
Quad G5 / Mini G4 / PB15 G4 Mac OS X (10.4.5)

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How to monitor my shared network connection

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