Loopback-Connection

sdfsdfsdf

Hey there. I want to setup a OpenVPN server, but it seems like sth is wrong. To figure out the issue I'd like to be able to test config locally. So I want to connect a Client to a server on the same PC - is this somehow possible?
Up to now it seems like "local out port" must be the same as "remote in port", which would mean that loopback is not possible?!

Mimiko

It's possible, but you have to install two tun-adapters. And don't use lport on client.

sdfsdfsdf

ok, but how do i setup a 2nd TAP-Adapter? and what is lport?

Mimiko

Installing second TUN adapter http://answers.microsoft.com/en-us/windows/forum/windows_vista-hardware/tun-miniport-adapter-2-in-vista/acebde73-78bc-497b-8f43-b78576fdc6a7
lport: http://www.openvpn.net/index.php/open-source/documentation/manuals/69-openvpn-21.html

sdfsdfsdf

ah, so if there are lport and rport, why cant I just use a rport for destination an another lport for source? this should work for loopback?!
I wonder why http://wiki.openvpn.eu/index.php/Erster_Tunnel suggests a tap for first tunnel uasage - loking at Forum rules this seems to be a bad idea somehow (would be nice to know why)?!
The thread you linked is about fixing a tun, not about installing it, is it?!
edit: semms like "Add a new TAP-Win32 virtual ethernet adapter" doesnt exist in my start menus openvpn folger?!

Mimiko

the virtual adapter can be TUN or TAP by the command you use in config file.
When installing tun adapter you give it a name. So you can give another name.
Just don't use rport and lport in your config files for server and client.

sdfsdfsdf

"When installing tun adapter" - well thats just the problem ^^ - In documentation it's said, that there should be a link in my start menu - which just is not there 😉

If you are using Windows, each OpenVPN configuration needs to have its own TAP-Win32 adapter. You can add additional adapters by going to Start Menu -> All Programs -> OpenVPN -> Add a new TAP-Win32 virtual ethernet adapter.

Mimiko

The comand from start menu is for Microsoft's tun-adapter. The one used with openvpn must be started from a command line. Just browse to the tap driver folder and run:

tapinstall install tap0

for adding a tap adapter 0, or tap1 for the following one.

sdfsdfsdf

it diddnt work directly, bu i managed to fix it.

now the server/client works - I restarted with sample config.
But i wonder about is:

the client gets IP .6 (every time), but in ipp.txt its logged as

clientname,10.8.0.4

?!

Mimiko

ipp.txt is not always updated imediatly upon client connected, its rather updated when client is disconnected.