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Date:      Wed, 4 May 2011 16:19:10 +0100
From:      krad <kraduk@gmail.com>
To:        Kevin Wilcox <kevin.wilcox@gmail.com>
Cc:        Free BSD Questions list <freebsd-questions@freebsd.org>, geoff@apro.com.au
Subject:   Re: Can I bridge the same subnet across a VPN?
Message-ID:  <BANLkTi=BfGDvym1GyBmvooMn1dbhT4UcTA@mail.gmail.com>
In-Reply-To: <BANLkTimCMBvCQqOE=8Xfd9_ZF-aQeWBGEA@mail.gmail.com>
References:  <201105040519.56695.geoff@apro.com.au> <BANLkTimCMBvCQqOE=8Xfd9_ZF-aQeWBGEA@mail.gmail.com>

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On 3 May 2011 20:44, Kevin Wilcox <kevin.wilcox@gmail.com> wrote:

> On Tue, May 3, 2011 at 15:19, Geoff Roberts <geoff@apro.com.au> wrote:
>
> > Is it possible to join two sites with the same subnet across a VPN?
>
> Yes.
>
> > I have two sites that have the same subnet/mask.
> >
> > I need these two separated networks to behave as one across a VPN.
>
> That's understandable. You may want to consider breaking the /24 into
> two /25s, one at each site, and routing the connection instead but
> that's not necessary and you can indeed use a bridge with few issues.
>
> > Happy to use either IPSec or OpenVPN to actually encrypt the traffic.
>
> We've done it as a demo of what you can do with OpenVPN, it's trivial
> once you get some configuration issues straight in your head (or
> that's how it worked for me).
>
> To bridge in OpenVPN, take a look at:
>
>
> http://openvpn.net/index.php/open-source/documentation/miscellaneous/76-ethernet-bridging.html
>
> kmw
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you can do this with a combination of openvpn (using tap, not tun) and
if_bridge both ends. However I have found it to be flakey and not really
worth the effort. Better to go with a routed solution.



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