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Anonymous_User
Contributor
April 16, 2010
Question

Extending LAN subnet across WAN

  • April 16, 2010
  • 3 replies
  • 2857 views
I have two locations: Main Office is 10.2.0.0 subnet and Branch office is 10.4.0.0 subnet. Locations are connected via WAN and all works fine. What I an trying to develop is a way to extend my LAN subnet in Main Office to be able to route to the Branch Office if needed. For example, and in simple scenerio, I want to be able to move a virtualized machine to a VM server in Branch office and have it accessable without having to change IP addresses. I' ve seen this called Bridging or extending the network and I think it operates at the Layer 2 level. I know there may be other pros and cons to doing this, but in a nutshell... can it be done at the Fortigate level? thanks

    3 replies

    TopJimmy
    TopJimmy
    New Member
    April 19, 2010
    My network experience in this area is sorely lacking. I am curious as well.
    MasterBratac
    MasterBratac
    New Member
    April 20, 2010
    You could use Fortigate in transparent mode for IPSEC VPN at Layer2. http://docs.fortinet.com/fgt/handbook/fortigate-ipsec-40-mr1.pdf Read the chapter about transparent mode VPNs. You could even split a fortigate in multiple VDOMs, of which one runs transparent and the other one runs NAT mode.
    Carl_Wallmark
    Carl_Wallmark
    New Member
    April 20, 2010
    there are a few things you can do, go to http://kb.fortinet.com and search for " subnet overlapping" and " proxy arp" i have a network with the same subnet on both sides, it can be done, but there are some limitations as well
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