VPN in 2 different locations

benghee · Apr 23, 2014

Hi,

I have a software with 1 primary and 1 secondary user activation code. The software require both activate under the same LAN. I had activated primary as the server, but for secondary, I need it install in different location out of the LAN. If I use VPN, how do I make both of them thinks that secondary is still under the same "LAN"? Thank you for giving guidance for me.

bill001g · Apr 23, 2014

That is almost too hard to guess how it works. It depends what it meant by lan and how they validate.

It could just need to come from the same internet address if they are using a central server to validate. That a VPN might work but you would have to find a way to just send that traffic over the vpn and out the internet at the remote site but leave the rest of your internet traffic going out the local connection. You do not want to send all your internet traffic to the remote site over a VPN tunnel and then go right back out the internet you will be consuming at least double the internet traffic.

If it really must be on the same subnet ie lan because the software somehow validates this say by sending traffic between them it is going to be tough. You can build a VPN but it is called L2TPv3. This is used to bridge a lan over a routed network. To get this to really work ..ie filter things like DHCP but let other broadcast cross you need some fairly advanced equipment. This is easily done with some commercial network equipment but you general consumer routers and switches do not have the feature. It might be supported in dd-wrt or other third party firmware.

Its tough to say how they do it. How would they handle a large company that has multiple subnets in a building and uses a load balanced internet connection where the users could have different internet addresses from time to time.

benghee · Apr 27, 2014

Thanks, bill001g. Sounds like a very tough work to do. But I will give it a try.
Appreciate your kind advice. Have a great day.

bill001g :

That is almost too hard to guess how it works. It depends what it meant by lan and how they validate.

It could just need to come from the same internet address if they are using a central server to validate. That a VPN might work but you would have to find a way to just send that traffic over the vpn and out the internet at the remote site but leave the rest of your internet traffic going out the local connection. You do not want to send all your internet traffic to the remote site over a VPN tunnel and then go right back out the internet you will be consuming at least double the internet traffic.

If it really must be on the same subnet ie lan because the software somehow validates this say by sending traffic between them it is going to be tough. You can build a VPN but it is called L2TPv3. This is used to bridge a lan over a routed network. To get this to really work ..ie filter things like DHCP but let other broadcast cross you need some fairly advanced equipment. This is easily done with some commercial network equipment but you general consumer routers and switches do not have the feature. It might be supported in dd-wrt or other third party firmware.

Its tough to say how they do it. How would they handle a large company that has multiple subnets in a building and uses a load balanced internet connection where the users could have different internet addresses from time to time.

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