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VPN settup using Nat

Posted on 2014-12-11
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Last Modified: 2015-01-02
Any advice how I setup two sites on a VPN but have them on the same subnet? In other words connect a vpn between head office and a branch for DR. But have both of the sites on 192.168.2.*. i guess it would be nat-ting
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Question by:Gregopsg
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8 Comments
 
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Expert Comment

by:Miftaul
ID: 40495359
Please tell which router are you using.
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Author Comment

by:Gregopsg
ID: 40495367
Cyberoam on both sides CR25ing.
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LVL 95

Expert Comment

by:John Hurst
ID: 40495373
But have both of the sites on 192.168.2.*.  <-- You really need two different subnets for VPN to work properly.  I do this for several small clients and do not have any issue. Why do you need the same subnet?
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Accepted Solution

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Gregopsg earned 0 total points
ID: 40495395
The idea (pipe dream) is to be able to bring the server on the remote site to the head office, plug in and go without changing anything. I advised against this but someone said it could be done via Nat (But doesn't know how) Ha ha. At present the subnets are 192.168.2. and 192.168.3. I cant get the vpn working but IHeadoffice2.jpgHeadoffice.jpgBranch.jpg have some wrong config somewhere. Would you mind checking it for me? Attached the two configs.
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Author Comment

by:Gregopsg
ID: 40495396
Have removed the external IP's
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LVL 11

Expert Comment

by:Miftaul
ID: 40495401
I have done it on SonicWalll,

You need to create a dummy virtual subnet, say  dummy=192.168.10.0/24

Now on the vpn configurations page, select source as local subnet and destination as dummy subnet  on both end. And select NATed in the vpn advanced tab.

Here is the cyberom instruction Cyberom Link

This is not a good design, if possible change subnet in any of the sites.
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LVL 95

Expert Comment

by:John Hurst
ID: 40495969
This is not a good design, if possible change subnet in any of the sites.

I agree. In addition VPN naturally needs to resolve each device with its own IP. Having two devices as 192.168.75.1 makes it very complicated.

The idea (pipe dream) is to be able to bring the server on the remote site to the head office, plug in and go without changing anything

Time has a way of wrecking dreams. It really is easier to change the internal DHCP range and restart everything.
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Author Closing Comment

by:Gregopsg
ID: 40527427
Was on the money - sorry about delay
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