May not be able to help ya with the Network adapter... but the sound..
WELL... for some reason, FC4 ships with a default setting on the sound card which renders it to have no output.
After verifying the PCM and Master volume settings a hundred times, in desperation I started tweaking everything...
It turns out that there's a setting to the far right of 'alsamixer' called 'External', when you highlight it, press 'M', That should change the box above it from 'MM' to 'OO'. Try to play a sound now...
This worked on my Acer Ferrari 4005WLMi.