Description of problem:

I have two ethernet adapters, eth0 and eth1. The first is the built-in
motherboard adapter which I don't use (nothing is plugged in) and the second is
an Intel gigabit add-on controller card.

I have nothing plugged into eth0. My network is plugged into eth1.

During the anaconda fresh net install (not an upgrade), it was able to download
the stage2 image but once it got to the point of connecting to a yum repository
it failed -- the network connection was unavailable.

I was able to continue by switching to another virtual console and manually
doing:

ip route flush all
ip route add 192.168.1.0/24 dev eth1
ip route add default via 192.168.1.1

At this point the network routed via the correct adapter, all was well, and I
was able to continue the anaconda install.