[Blink] Client/Identity IP Configuration

Adrian Georgescu ag at ag-projects.com
Wed Jun 23 20:40:49 CEST 2010

Hello Fred,

We had previous threads on this mailing lists about VPNs in general  
and how every setup is different from another and how non- 
deterministic is to support such environments in way to make everyone  

Practically, in order to auto-detect netwok configuration changes  
without asking the users into becoming IP experts we only bind to the  
interface that has a default route to the Internet.

This compromise in the design covers most of the normal cases but  
unfortunately not yours.


On Jun 23, 2010, at 3:24 PM, Fred Schroeder wrote:

> Hi,
> I'm trying to use Blink in a very specific but most likely not  
> unsual setup
> and encounter a problem.
> Our company is running an Asterisk VoIP PBX in our company
> LAN. I access this LAN via Tunnelblick VPN client from my Mac.
> Working in my home-office in my own local area network this
> leads to a conflict:
> A IP address (within a class c net) is assigned to
> my Macbook in this local network.
> The roadwarrior VPN-configuration (host-network) brings up another  
> tun0
> device with a different IP 10.42.x.x as part of the VPN
> which connects my notebook to our company LAN (10.3.X.X) including
> the Asterisk.
> So network, routing is setup and everything works fine - except for  
> the
> Blink - Asterisk connection.
> It looks like Blink binds itself to the en0 interface of the notebook
> with its IP. This leads to some issues in the communication with the
> Asterisk:
> Allthough the SIP-Headers of the registration packages sent
> to the Asterisk include the en0 ( IP the Asterisk
> wants to talk to the VPN IP 10.42.x.x. So we end up in a kind
> of deadlock in this registration process, because Blink won't
> answer to any packets received on the tun0 interface (10.42.x.x).
> So my question:
> Is it possible (e.g. via config file) to bind Blink to the tun0 IP
> or generally to another IP/interface than en0?
> I'd like to do so because I wouldn't need to bother with NAT
> or whatever in such a setup.
> Setup:
> Mac OS X 10.6.4
> Tunnelblick 3.0
> Blink 0.18.2
> Regards,
> Fred
> P.S.: Blink is an amazing client. I really like it.
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