@ixtab: Yeah, I realized that's what you probably meant when I finished writing the answer... Oh, well
. Might help someone else understand
That led me to the PEBKAC conclusion, because the script is so very simple (and atomic, if it switched usbnet, it switched iptables too), that it's either that or a volumd/pmond quirk
That stuff tastes like, well, nothing! It's all in the seasoning! I could just 'eat' straight gravy, same effect ^^.
Now, foie gras (duck/goose liver), on the other hand... That, I love ^^.