Fun. Or not really that much when it isn't working :D
Shall be fixed, soon.
For the record, being 23 seems no different than being 22. Yet.
Update: Soon turned out to be about 2 hours after this post :D Figured out that I'd messed up the
iptables FORWARDchain rules...and once rectified, everything started automagically working :) Also, seems the LAN card is okay...since there's a 1 year warranty on it, I'm not getting it replaced unless the problem happens again.