IP Tunnels

Just a query.I'd like to know more about IP Tunnels. From what i have read its essentially a good way to connect two different networks. Anyone have good examples of using vpn software and tunnels. Say connecting phones or tablets from a customer to certain IP tunnels....
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Indie101Asked:
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InfamusCommented:
This is an explanation for GRE tunnels and how to create one.

https://supportforums.cisco.com/docs/DOC-2569
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giltjrCommented:
Can you tell us exactly what you are trying to accomplish?

An IP tunnel is a way to connect is a way to create an encrypted connection over the public Internet either between either a single computer and a remote site, or two remote sites.

This is to allow either connectivity to hosts/services that you don't want to give general access over the Internet.  Say you have a file server for your company that you want employees to access from their home.  You really don't want to put the file server "live" on the Internet, so you setup a VPN server that allows employees to connect to it and then it routes traffic between the file server and the employee's home computer.
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Indie101Author Commented:
I'm looking to connect a cradlepoint 600b router where i work and have it setup on a private APN. But connect to it with devices.....I'm wondering how i can acheive it with using tunnels

Thanks for response...
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InfamusCommented:
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Indie101Author Commented:
Thanks I'm looking for someone to explain use of tunnels in a simple example much appreciated

Where phones\tablets used , vpn agent and tunnels are used...Also why GRE tunnels are used, a whole overview in a paragraph would be great
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giltjrCommented:
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Indie101Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for Indie101's comment #a39864609

for the following reason:

Accepting own comment as other comments not fulfilling criteria.
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giltjrCommented:
It difficult to provide a meaningful sample, as each device/software has their own way of setting up tunnels.

The use of a tunnel was explained, if its not clear, then ask for clarification.

Also not sure what you mean by "APN", can you please explain what that is in reference too?
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