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Private and Public IP Addresses (view source)
Revision as of 15:55, 9 January 2018
, 15:55, 9 January 2018no edit summary
'''Public static''' - some times called '''Dedicated''' means the IP address never changes.
'''Public static''' - some times called '''Dedicated''' means the IP address never changes.
'''Public dynamic''' - means the IP address can change from time-to-time (typically when you lose connection and re-connect).
'''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 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.
==Private IP address==
==Private IP address==
'''Private IP address''' (''Internal'') is only used by devices communicating to each other on the same network.
'''Private IP address''' (''Internal'') is only used by devices communicating to each other on the same network. Devices with private IP addresses cannot connect to the Internet directly. Likewise, computers or other devices outside the local network cannot connect directly to a device with a private IP.
Devices with private IP addresses cannot connect directly to the Internet. Likewise, computers or other devices outside the local network cannot connect directly to a device with a private IP.
An IP address is considered private if the IP number falls within one of the IP address ranges reserved for private networks such as a Local Area Network (LAN). The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private networks (local networks):
An IP address is considered private if the IP number falls within one of the IP address ranges reserved for private networks such as a Local Area Network (LAN). The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private networks (local networks):
[[File:Private public ip 3.png]]
[[File:Private public ip 3.png]]
The scheme above roughly describes how devices with private IP addresses communicate with a remote host on the Internet with the help of NAT. Bellow the scheme is a depiction of a NAT table. It illustrates how the router differentiates to which device in the local network to redirect incoming data.
==IP Address Terminology==
==IP Address Terminology==
'''Dynamic''' means the IP address can change from time-to-time.
'''Dynamic''' means the IP address can change from time-to-time.
'''Public''' means the IP address can be visited from any computer in the world.
'''Public''' means the IP address can be reached via the Internet from any computer in the world.
'''Private''' means the IP address can only be used by those on the same network.
'''Private''' means the IP address can only be reached by other devices on the same network.
'''Shared''' means other people use your IP address for their connection.
'''Shared''' means other people besides you use your IP address for their connection.
'''Dedicated''' means no one else uses your IP address for their connection.
'''Dedicated''' means no one else uses your IP address for their connection.
'''Class''' identifies the range of your IP address and the default subnet mask.
'''Class''' identifies the range of your IP address and the default subnet mask. Examples of IP classes:
''A class - 0 to 127 with default mask of 255.0.0.0''
*''A class - 0 to 127 with default mask of 255.0.0.0''
''B class - 128 to 191 with default mask of 255.255.0.0''
*''B class - 128 to 191 with default mask of 255.255.0.0''
''C class - 192 to 223 with default mask of 255.255.255.0''
*''C class - 192 to 223 with default mask of 255.255.255.0''
''D class - 224 to 247 (not currently used)''
*''D class - 224 to 247 (not currently used)''
''E class - 248 to 255 (not currently used)''
*''E class - 248 to 255 (not currently used)''
==Frequently Asked Questions==
==Frequently Asked Questions==
''If you prefer a static IP address, contact your service provider. Customers can sometimes obtain a static IP by subscribing to a special service plan and paying extra fees.''
''If you prefer a static IP address, contact your service provider. Customers can sometimes obtain a static IP by subscribing to a special service plan and paying extra fees.''
'''Can I setup remote access for router with dynamic IP address'''
'''Can I setup remote access for my Teltonika router with a dynamic IP address?'''
''Yes. You can use [[Dynamic DNS]] or [[RMS]] services ''
''Yes. You can use [[Dynamic DNS]] or [[RMS]] services.''
'''What are the advantages of a static IP and what are its disadvantages?'''
'''What are the advantages and disadvantages of a static IP address?'''
''Advantages:''
''Advantages:''
''Convenient remote access – When you remotely connect to a router you need not worry about the changes in the IP address.''
''Convenient remote access – when you remotely connect to a router you need not worry about the IP address changing.''
''Static IP addresses are more stable for Internet use since they never change. In cases of a dynamic IP address, the Internet service provider may automatically change the address on a regular basis, as frequently as every few hours. This can cause a lapse in the connection.''
''Static IP addresses are more stable for Internet use since they never change. In cases of a dynamic IP addresses, the Internet service provider may automatically change the address on a regular basis, as frequently as every few hours. This can cause a lapse in the connection.''
''Disadvantages:''
''Disadvantages:''
''Security – router with a static IP address is much easier to track through the Internet. Static IP Address could be a security risk as the IP address is constant. There is a greater chance of hacking.''
''Security – a router with a static IP address is much easier to track through the Internet. A Static IP Address could be a security risk as the IP address is constant, therefore, there is a greater chance of hacking.''
'''What are the advantages of a dynamic IP and what are its disadvantages?'''
'''What are the advantages and disadvantages of a dynamic IP address?'''
''Security – routers having Dynamic IP address have relatively lower security risk.''
''Security – routers that have Dynamic IP addresses have a relatively lower security risk.''
''Remote Access – for permanent access router from remote you will need a DNS address service that can update your IP address regularly.''
''Remote Access – for permanent access to the router from a remote location you will need a DNS address service that can update your IP address regularly.''
==External links==
==External links==
https://www.iana.org/
https://www.iana.org/
https://www.internic.net/
https://www.internic.net/