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Basic NAT (cont)
map to 0/32 is special: is replaced by the IP address of the specified interfaces
map to 0/0 is also special: no mapping is done (we'll see later why that is handy)
"map" maps ip numbers in unpredictable ways (first come first serve). It rewrites source addresses on outgoing interfaces
If a mapping fails, the packet goes through unmodified: use IP filtering as well!