Must reconnect to interner each time I start up..

I live in Japan and have Yahoo bb service.

I have Ethernet connected and PPPoE connected and I can use the internet.

but when I restart the computer the PPoE is not connected. I must reconnect everytime I restart.

This is really annoying.

Can anyone help me?

Out of interest, shut your machine down and then power back up again. Are you connected after doing this without the need to do anything else? I say this because that is what is happening with my iMac running Lion. It only takes up a minute of my life but I'm wondering if it's symptomatic of something more sinister than a bug - iMacs losing connection to the internet was the number one problem I encountered online when doing my research prior to switching.

In System preferences > Sharing.

Set up your preferred network settings (any ethernet settings or Wifi) under the location Automatic - a pull down menu at the top of the dialogue box.

Settings in that location will auto connect on start-up without any user intervention