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Private and Public IP Addresses (view source)
Revision as of 17:32, 11 January 2018
, 17:32, 11 January 2018no edit summary
A public IP address can be '''static''', '''dynamic''' or '''shared'''.
A public IP address can be '''static''', '''dynamic''' or '''shared'''.
===Dynamic and Static IPs===
'''Public dynamic''' - means the IP address can change from time-to-time (for example, when you lose connection and re-connect or the ISP might change the address periodically).
'''Public static''' - some times called '''Dedicated''' - means the IP address never changes. '''Public dynamic''' - means the IP address can change from time-to-time (for example, when you lose connection and re-connect or the ISP might change the address periodically).
[[File:Dynamic and static ip.JPG]]
The figure above shows how a Dynamic IP address might change over time and that a Static (Dedicated) IP always stays the same. We can also see how it is easier to reach a device that has a Static IP address rather than a Dynamic one, because at any given we will be able to reach the device via the same IP address. From a remote control perspective this is a huge benefit when it comes to convenience. But it also possible to set up remote access to a device that has a Dynamic IP address using '''[[Dynamic DNS]]'''.
===Shared IPs===
'''Public shared''' - in some cases, an ISP can assign a public IP address to a group of users, and then employ NAT to isolate their traffic.
'''Public shared''' - in some cases, an ISP can assign a public IP address to a group of users, and then employ NAT to isolate their traffic.
[[File:Shared ip.png]]
In the example above we can see that it is possible for multiple devices, even companies and websites to share a single public IP address. However, this creates a huge disadvantage since an owner is no longer the only entity responsible for their IP address. For example, if one the multiple users of the same IP address commits an online felony of some sort and the IP address gets blocked, all of the users using that IP will get blocked as well.
==Private IP address==
==Private IP address==
''192.168.0.0 - 192.168.255.255 (Total Addresses: 65,536)''
''192.168.0.0 - 192.168.255.255 (Total Addresses: 65,536)''
==Difference between Public and Private IPs==
The main difference between Public and Private IPs is that we use Private in LAN or '''Internal''' networks for communication between local devices and we use Public IPs to communicate with devices that are located in '''External''' networks anywhere in the world.
[[File:Static public ip.png]]
The figure above roughly describes the difference between Private and Public IPs and Internal and External networks.
==IP Address Terminology==
==IP Address Terminology==
