IP Masquerading. Homes and Businesses: When you only have one IP but you have LOTS of machines. The problem. Extra IPs are an additional cost of you internet service. Masquerading lets you hook up multiple machines to the same IP
Homes and Businesses:
When you only have one IP
but you have LOTS of machines
192.168.1.2:100 -> 220.127.116.11:34567
(use same entry for reverse traffic)
OUTSIDE NEVER SEES NET 192.168.1.x, only 18.104.22.168!
Not a problem only because
the internal machines seldom use
a large number of the available ports
-> NO SUCH SERVICE
-> ILLEGAL ADDRESS
No way to access the service.
-> Can’t provide external services from the inside.
(you can but it requires some extra effort
and another software package … more later)