Description of problem:
The installation of Fedora fails (Anaconda filed a dump) when trying 
to install fc6 via CD when trying to have updates of the Fedora extras
at install, when using the one of the two installed network cards that wasn't
connected to internet. 

The installation worked when using the network card that was connected to internet.

Version-Release number of selected component (if applicable):
fc6

How reproducible:
Tested two times with the same chosed options, same result both times.
Tested with using the connected network card and the installation finished.

Steps to Reproduce:
1. pc with two network cards
2. one of the network cards not connected to internet, the second connected to
internet.
3. choose to upgrade Fedora extras
4. fail.
  
Actual results:
Anaconda fails and dumped a file to floppy

Expected results:
Anaconda may give the user the possibilty to choose not to install
Fedora Extras when the network card not is connected to the internet;
or the possitility to choose the second network card if there is any available, 

Additional info:
Network card on motherbord was connected to internet (motherboard ASUS A8N-E)
The second network card (D-Link DFE-530TX), wasn't connected to internet.