(H9) Day6 Networking Ess part6 Private IP Address, NAT and PAT 

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Private IP Address:
Class A: 10.0.0.0 - 10.255.255.255 - 10.x.x.x
Class B: 172.16.0.0 - 172.31.255.255 - 172.16.x.x, 172.17.x.x, ., 172.31.x.x
Class C: 192.168.0.0 - 192.168.255.255 - 192.168.0.x,192.168.1.x.., 192.168.255.x
Non routable in public
We can’t access internet with private ip address
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We use NAT and PAT technique to access public network(internet)
NAT - Network Address Translation
PAT - Port Address Translation (NAT Overload)
NAT - Maps Inside(private) IP address to Outside(Public) Ip address
Devices can communicate in private with private ip, when they communicate to outside(public) they use public ip address
1 private - 1 public , 10 private - 10 pubic
PC1: 10.0.0.11 - 21.2.2.11
PC2:10.0.0.12 - 21.2.2.12
PC3:10.0.0.13 - 21.2.2.13
PAT - Maps Multiple (All) Private ip address to 1 Public ip address
10 private - 1 public
PC1: 10.0.0.11:1234 - 21.2.2.110:1234
PC2: 10.0.0.12:1352 - 21.2.2.110:1352
PC3: 10.0.0.13:5422 - 21.2.2.110:5422
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