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Re: [Discuss-gnuradio] gr-extras: tuntap : How to use ?

From: Iain Young, G7III
Subject: Re: [Discuss-gnuradio] gr-extras: tuntap : How to use ?
Date: Thu, 04 Oct 2012 19:22:47 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 03/10/12 18:57, Josh Blum wrote:

On 10/03/2012 10:21 AM, Iain Young, G7III wrote:

I found the tuntap block, and noticed that it had an input and output.
I was expecting my flowgraph to take the userspace end of the network
interface, with the other end being the network device.

I found the presentation from the recent conference on a basic MAC
layer, and that seemed to imply the input could be almost anything,
but didn't leave me any the wiser as to exactly how to use it.

Basically, the TUN/TAP block was there for the purposes of replacing
tunnel.py. Few people *actually* want to pipe stuff through a virtual
ethernet interface.

Heh, I always did like to be different :)

For the example, we will probably replace that block with the "socket
msg" block. You can just open netcat on the host/port and use it like a
wireless IM chat session :-) There will soon be a demonstration video w/
the MAC layer stuff presented.

I shall look forward to that

Instead, try the "socket to blob" block. Outside the flowgraph, open a
socket and send packets.

But the input to the tuntap block has confused me. Can I just give
it a Null source ? (With the block picking up data from the network
device ?)

I pushed a change adding<optional>1</optional>  to the input and output
ports. You shouldnt need to actually connect.

Great, thanks. Everything now works as expected, and wireshark receives
ethernet frames from my RX tun interface, when I connect the GMSK
Modulator and Demodulator together back-to-back. And yes, it also works
with the Socket-to-Blob blocks :)

Now I just have to figure out what filtering, amplification, levels,
and frequency offsets I need to make it work via my USRP and also
soundcard interfaces.

Not had much success yet, and my rates are somewhat more narrow-band
than most examples out there. Ah well, I'll figure it out at somepoint

Thanks again


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