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Re: [Openvpn-users] Routing Vs Bridged? Setup?


  • Subject: Re: [Openvpn-users] Routing Vs Bridged? Setup?
  • From: "Dave Lau" <dave@xxxxxxxxxxxxxxxxx>
  • Date: Fri, 29 Aug 2003 00:46:34 -0500

Hi, Dave,

In my humble opinion, the easiest way to set up bridging is to ignore the
instructions listed on the shorewall page you linked to, and do everything
just as the HOWTO on openvpn.sourceforge.net describes it instead.  Bridge
your tap0 adapter to eth1 (or whatever your local area network adapter is)
as the new bridge device "br0".  Then, for all intents and purposes, you can
go into your /etc/shorewall/interfaces file and change it from this (or
something close to it):

#Zone    Interface     Broadcasts    Options
net         eth0            detect            -
loc         eth1            detect            -

To this:

#Zone    Interface     Broadcasts    Options
net         eth0            detect            -
loc         br0             detect            -

That should really be about it.  All your old shorewall rules and policies
which applied to "loc" will now pertain to the br0 interface instead of
eth1, just like you want (or at least, just like I **think** you want.
Maybe I'm mistaken).  Do this on both sides of your tunnel, and make sure to
change your DHCP server (if you are running one) to hand out DHCP on device
br0 instead of on eth1.  If you use bridging in this manner, you should have
no problems passing broadcast traffic between your two networks.  Also keep
in mind that if implemented this way, you will only need 1 DHCP server - it
will work just fine through the tunnel.  In fact, running two might cause
you some problems.

Just to make sure bridge is created properly before shorewall starts, I
write a simple shell script to set up the bridge, and called that shell
script from /etc/shorewall/init, which runs automatically at the very
beginning of a "shorewall start" command.

Good luck!
Dave

----- Original Message ----- 
From: "Dave B" <dragin33@xxxxxxxxxxx>
To: <openvpn-users@xxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, August 28, 2003 10:50 PM
Subject: [Openvpn-users] Routing Vs Bridged? Setup?


> Hi.  I have two linux systems being used as a router/gateway for two
> separate lans on the internet.  I wanted to use these boxes to create a
VPN
> between the networks as well so i looked up openvpn because it supported
> bridging.. more importantly broadcast packets for gaming.  I use shorewall
> on both systems and shorewall's website has a guide to setting up a
bridged
> openvpn here: http://www.shorewall.net/OPENVPN.html   I read through the
> HOWTO on openvpn.sourceforge.net and also the bridge mini-howto.  To be
> honest i find the steps in the mini-howto hard to re-apply to my network.
> It seems like some of the things he's doing.. if some of those thing in
> shorewall then i would bring my lan's connection down.  I was wondering
what
> the difference between the "bridging" configuration on shorewall's website
> and the "bridging" configuration on openvpn's differ?  Is there anyone
that
> has got bridging to work with shorewall (and with all the goodies like
> broadcast, netbui, and ipx/spx?)
>
> Thanks!
>
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