Option to turn off listen port, e.g. client only mode

[Guus Sliepen]

On Wed, May 14, 2014 at 04:24:39PM +0200, Kenth Andersson wrote:

> Everything works great, but I have a feature request I’m not sure if this is the correct place for it, but since HostA in my case is the only host that accepts incoming connections (both the other hosts are behind firewalls) I would like to set Port = -1 on both HostB and HostC in tinc.conf to tell them to NOT listen for incoming connections, since there is no way they will ever get one. 
> 
> Why do I want to do this? Basically I don’t want to take up a port just for having a listen socket on port 655 that no one is ever going to connect to.
> 
> By setting  "Port = -1", you would be able to tell tincd to act as client only… 
> 
> Maybe there is already such an option available by doing something else, but I couldn’t find anything in the documentation and I read thru the source code in net_setup.c and didn’t see anything about it either.

You can actually do this already, and indeed it is an undocumented
feature: use "Port = 0". Note that it will still create a listening port
(tinc needs to do this at least for UDP), but it will be a random unused
one.

-- 
Met vriendelijke groet / with kind regards,
     Guus Sliepen <guus at tinc-vpn.org>
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