[TriLUG] OpenVPN: TAP vs TUN

[Jim Ray]

make sure source and destination IP addresses are *not* on the same 
network address.

regards,

jim

Jim Ray, President
Neuse River Network, Inc.

tel: 919-838-1672 x111
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Paul G. Szabady wrote:

>Greetings,
>
>I am trying to set up a TAP style VPN but I'm apparently missing a key
>piece of information and was hoping someone could clarify this for me.
>
>I have a linux (CentOS 4.2) server w/OpenVPN (openvpn-2.1_beta7-1
>installed from RPM built from src), and a windows 2000 server behind a
>linksys router.  I need to be able to access the windows server on the
>local LAN from the internet, with an IP address in the same subnet as the
>windows server, hence the desire to set up using TAP/bridge mode. 
>(Setting up TUN was easy, but didn't work as I needed it to.)  The linux
>machine has a single NIC, which is why this is so confusing to me.  When I
>set up OpenVPN w/TAP, I lose all network access to the linux server. 
>Having had a "home grown linux switch" (old pc w/6 NICs running in bridge
>mode), this makes sense.  I believe I have followed all the
>instructions/notes/suggestions from the openVPN howto as well as the
>Ethernet-Bridge-netfilter howto.  But I'm still missing something.
>
>The big question:  If I am apparently invisible to the network, how does
>one make a connection (VPN or other) to the linux server?
>
>  
>