What are Local IP and Global IP?

April 1st, 2014 by Rossy Guide

Local IP

A network may contain multiple computers or other devices each having their own IP address (or addresses). A local IP address is a network device’s IP address intended to be used by other computers on a LAN to identify it. A local IP address is often a private IP address, although computers connected directly to the Internet via cable modem, for example, are given public addresses. Note that local IP addresses only loosely relate to geographic location.

Global IP

The global IP address is the IP address at which others on the internet see your connection as originating from. The global IP address is unique and assigned only to a single device. It can be moved to different servers in different locations.

Global IP’s provide IP flexibility by allowing users to shift workloads between servers. Global IP’s also provide IP persistence by allowing for transitions between servers and CCI’s.

To configure a global IP to your windows server, please complete the following steps:

Browse to

1. Start >> Control Panel >> Network Connections >> Local Area Connection (Public) (properties).
2. Select “Internet Protocol (TCP/IP)” and click Properties >> Advanced.
3. From here you will need to select “Add” in the IP addresses section and enter in the IP address and Subnet mask.
4. Once this is complete, simply “OK” back to the desktop.
5. To verify that your settings have taken effect, open a dos prompt by browsing to Start >> Run >> “cmd” and run the command ‘> ipconfig /all‘.

 

Difference between them:

o A global IP address is assigned to a computer or modern by an internet service provider and can be communicated with from anywhere on the internet.

o Global IP addresses are unique and assigned only to a single computer or device.

o Local IP addresses (Private IP Addresses) are assigned by a router and include 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255 and 192.168.0.0 to 192.168.255.255.

o Local IP addresses can only be used to communicate within a closed network.

As an example: Bob’s house has two computers and a router. Bob is assigned an IP address of 78.182.2.17 by his ISP. Both of Bob’s computers are connected to a router which is connected to the internet. Router IP: **** Local: 192.168.0.100, Global: 78.182.2.17, Computer one IP: 192.168.0.101 and Computer two IP: 192.168.0.102. When Bob uses either computer one or two to connect to the internet the traffic is passed by the IP address 78.182.2.17 which is his global IP address. The router acts as a gateway to the internet using this IP address. Bob can however communicate between his two computers within his house using the 192.168. IP addresses. If someone on the internet wants to communicate with Bob they use 78.182.2.17 and the router determines which of Bob’s two computers the traffic is intended for as the 78.182.2.17 IP address in this case is actually Bob’s router and is not directly assigned to either computer. Local IP addresses must be unique within a network but individual networks can use the same internal IP addresses provided and they are not connected.

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