Network preferences and connections

I use a wireless router to connect to the net via an adsl modem using a pppoe connection.
I have two connections in my network preferences. One is for the direct, hard line connection. The second is for the airport (wireless connection). I only use one at a time.
First question:
The First hard line connection always trys to connect automatically to the net when I don't necessarily want it to. Can I stop this or turn it off?
Second:
When I use the airport wirelessly via Airport (which is always on) it often has problems loading the page and says i am in offline mode. usually refreshing or restarting firefox solves the problem but it can be pretty annoying to have to reload every time. As soon as I turn on my macbook the airport shows it is connected to my corega network (the modem brand). What's the issue?
Thx

You can change the service order so the Airport connects first, but if you have an interface that's enabled it will always try to connect. Two ways to handle this would be to disable the connection when you don't want to use it, or to set up a different "Location" for your different network needs.

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