[Xastir] dual port TNC

[Tom Russo]

On Tue, Jun 16, 2009 at 11:15:13AM -0600, we recorded a bogon-computron collision of the <russo at bogodyn.org> flavor, containing:
[TNC sharing]
> 
> I have been trying to figure out ways to do this without ldsped, and they
> all seem to revolve around "kissnetd" and remserial.
> 
> The thing that's missing is a simple program that can tie together two
> ax.25 network ports.  Digi_ned's web page describes a way of doing it with 
> digi_ned, but since I don't really want to do any digipeating that seems the
> wrong approach.
> 
> Here's what I've thought might do the trick if that one piece were available:
> 
> 
> 
> 
>        +--- ax25bridge---+            2   3   4
>        |                 |            pty pty pty
>      ax25p1            ax25p2         |   |   |
>        |                 |            |   |   |
>      KISS TNC           PTY1          |   |   |
>                          |            |   |   |
>                          +--kissnetd--+---+---+
> 
> That is, there's an AX.25 kernel interface to a real tnc, bridged simply
> to a second ax.25 interface that talks KISS on a PTY.  kissnetd creates
> a fake network of PTYs that all talk KISS to one-another.  The ptys can be
> attached to applications, or to remserial.  Obviously, the PTYs are really
> pairs of devices, I'm just showing them as one for simplicity of the figure.
[...]
> 
> It's that simple bridge that doesn't seem to exist.  
[...]

Someone here just mentioned socat in this thread.  I've never used it, but
it appears that it could possibly be exactly the tool for the job:

 socat INTERFACE:ax25p1 INTERFACE:ax25p2

Has anyone used socat to connect interfaces directly this way?  If it works
then perhaps the little ugly ascii graphic above can be implemented trivially
with existing tools (socat, kissnetd, remserial, and ax.25 kernel networking).

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
  In some cultures what I do would be considered normal. 
                                  -- Ineffective daily affirmation