Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 203
  • Last Modified:

device to device VPN from office to office of a different network, but the same subnet

I am trying to implement a VPN (device to device) from one office (192.168.20.64-127 subnet 255.255.255.192) to the other office (192.168.20.128-191 subnet 255.255.255.192). The devices have been configured, and the policies have been created, but the tunnel never gets initiated.
I ran this by someone that's told me that I'd at least have to change the subnet of one office, in order to get it to work. Is this true?
If both networks are going to route requests for the other network through the vpn device (router), because they are addresses outside of their range, how could this be true?

Thank you in advance.
0
effincomputers
Asked:
effincomputers
  • 3
  • 3
1 Solution
 
Rob WilliamsCommented:
VPN's require that the local LAN at either end of the tunnel use different subnets. Commonly someone might use something like:
192.168.1.1-254 with subnet mask of 255.255.255.0 and 192.168.2.1-254 with 255.255.255.0  Your configuration also segregates the 2 network segments by putting them on different subnets which is fine and should work well, assuming you are aware the "normal" usable IP's are 192.168.20.65-126 and 192.168.20.129-192 The other IP's in those subnets are the network ID and Broadcast IP. The routers will take care of the routing between subnets. That is what they do. Perhaps there is another issue.

What are you using to create the VPN tunnel?
0
 
effincomputersAuthor Commented:
Hi Rob. Thank you for your response.
I can troubleshoot the details. I just want to make sure that I'm not missing something here.
So you agree that the scenario I described is possible (factoring in the net ID and broadcast)?

Thank you.
0
 
effincomputersAuthor Commented:
The internal network is /26. The public IP's are /29. The VPN should only be concerned with the internal network addresses, in regards to tunnel initiation.
0
New Tabletop Appliances Blow Competitors Away!

WatchGuard’s new T15, T35 and T55 tabletop UTMs provide the highest-performing security inspection in their class, allowing users at small offices, home offices and distributed enterprises to experience blazing-fast Internet speeds without sacrificing enterprise-grade security.

 
effincomputersAuthor Commented:
sorry....wrong board
0
 
Rob WilliamsCommented:
>>"So you agree that the scenario I described is possible "
Absolutely.
If you were to adjust so that they were on the same subnet, you would have a routing conflict. Routers route traffic based on subnets. If they are the same the router will not know to which end of the tunnel the packet is destined, and it will be lost.
You're on the right track :-)
0
 
Rob WilliamsCommented:
Thanks effincomputers, good luck with it.
--Rob
0

Featured Post

Ask an Anonymous Question!

Don't feel intimidated by what you don't know. Ask your question anonymously. It's easy! Learn more and upgrade.

  • 3
  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now