Sorry for what I posted.. now I noticed (duh!) that many things
I said was plain wrong...

First, I can't get even passive connection to sunet.se. Except,
I have been able to connect to ftp.sunet.se from the NATted
machines. Second, when I start ftp connection to sunet, it does
go to .20, not .40.

Still, I can get active and passive FTP connection to ftp.funet.fi,
for example. Currently, it seems, the NAT machine refuses
completely to connect to sunet. And the machine with real address
does connect to ftp.sunet.se.

-- 
Arto Huusko  --  WWW: http://maailma.yok.utu.fi/
                  ** Divecalc **
The Diving Software @ http://maailma.yok.utu.fi/Divecalc