Ethernet active, airport also active... how to stop this security problem.

Im not sure if anyone else is noticing this but this is becoming a problem in an enterprise environment.
In the "Network Port Configurations"
I have "Built in Ethernet" as the top, then Airport below that.
The problem is that when the Ethernet is working (active) AND the airport is turned on and connected to a network it is ALSO active, grabbing an IP# and essentially bridging the two networks.
I have tested this many times and it works every time.
For example:
My MBP is connected to the LAN using Ethernet, and traffic is going through the Ethernet and has it's own IP (192.168.0.104) given by DHCP. If I turn on Airport and it finds (and connects) to a network (for example... Linksys? LOL) it will also grab an IP from that Airport network.
Now... if any services (AFS, Windows Sharing, WebSharing..etc) is turned on, you can access the MBP from EITHER network (Since the Airport grabbed and assigned an IP)!!! Even though in the "Network port configurations" it is setup to use the "Built-in Ethernet" first, if it can't find that then use Airport... BUT from what I can see this ONLY applies to Outgoing traffic and not necessarily both incoming and outgoing. It is essentially bridging the two networks
I cannot find a way to prevent this network security gap automatically. (If Ethernet is active then do not connect to any airport network, even if it's in my preferred list or an open network)
Another side effect...in an office environment which has Wireless services on the LAN, if your Airport is turned on and your using your Ethernet connection, your computer is using up 2 IP#'s out of your DHCP pool!
Anyone else having or notice this problem?

If I turn on Airport and it finds (and connects) to a network (for example... Linksys? LOL) it will also grab an IP from that Airport network.
And why would you do this? If you are connected to the LAN through the ethernet port why turn on Airport too? Or why have your Mac connect to an unknown WLAN by default?
When I take my MacBook to school I only have one connection active. On my Mac Mini that is running MacOS Server I have both ports enabled but I guess this is not the most common situation.
Now... if any services (AFS, Windows Sharing, WebSharing..etc) is turned on, you can access the MBP from EITHER network (Since the Airport grabbed and assigned an IP)!!!
People will be able to access your /Library/WebServer/Documents/ folder (or any of the users web documents folder) but that's not a security problem unless you have changed (and messed up) the default Apache definitions, changed the web server documents ownership and/or permissions or have some problematic PHP code or CGIs. As for AFS, Windows Sharing or FTP people won't get into your Mac unless you have and empty password or they know your password.
Even though in the "Network port configurations" it is setup to use the "Built-in Ethernet" first, if it can't find that then use Airport...
When you place the ethernet port first it really means "use this port first and use the others too whenever they are available".
PowerMac G5 1.8 Mac OS X (10.4.9) MacMini (10.4.9 Server), MacBook 2.0, 2nd internal HD, FW 500GB, FW 80GB

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