Comment 1 for bug 31261

I have the same problem on kubuntu dapper amd64 with latest updates

On the "Network Interfaces" page only lo shows up even though eth0 is working and active and I'm using it right now.

This bug was reported on KDE bugzilla but was dismissed because the person had the interface down.
http://bugs.kde.org/show_bug.cgi?id=122257
However, there is a "State" column on the page, so interfaces that are not activated should still show up, with "down" in that column.