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Date:      Wed, 4 May 2011 05:19:56 +1000
From:      Geoff Roberts <geoff@apro.com.au>
To:        freebsd-questions@freebsd.org
Subject:   Can I bridge the same subnet across a VPN?
Message-ID:  <201105040519.56695.geoff@apro.com.au>

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Hi,

Is it possible to join two sites with the same subnet across a VPN?

I have two sites that have the same subnet/mask.

I need these two separated networks to behave as one across a VPN.

All configuration examples I've come across so far assume that each site will 
have a different subnet. Eg, one site with 192.168.1.0/24 the other with 
192.168.2.0/24

I control the firewalls at each end. One will be a pfsense firewall, the other 
an existing FreeBSD 7.4 system.

For example I would want to be able to do the following:

Site A                           Site B
------                           ------
Firewall A 10.1.1.3  --------- Firewall B 10.1.1.4
      |                                       |
Subnet: 192.168.20.0/24       Subnet: 192.168.20.0/24

Happy to use either IPSec or OpenVPN to actually encrypt the traffic.

Kind regards,

Geoff





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