itojun@iijlab.net:
> 	what does vmstat -m and/or netstat -m say?

How could I tell? I can't even log in! ;-)

The problem is that the server is located in a very remote facility,
and going there is a major pain and nothing is problematic until you
can't login anymore (sic!). I'll try to re-route it to a computer room
in my galaxy and see what I can get out of it.