Indeed, the correct phrase would have been It's actually called IP masquerading under Linux. Whatever, the point was NAT is just about proxying by forging packe

Indeed, the correct phrase would have been It's actually called IP masquerading under Linux. Whatever, the point was NAT is just about proxying by forging packets with another identity and putting it back when packets comes back, and 'masquerading' conveys the idea quite nicely. I insist on forging because it is so, which makes ipsec puke since the packet changed unless you pile up yet some more hacks on top.