# Re: Help required tunnel.py

**URL:** <https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243>\
**Category:** GNU Radio\
**Created:** [July 8, 2010, 1:11am UTC](https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243 "2010-07-08T01:11:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Juan\_Q](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/c57346/32.png) [@Juan\_Q](https://www.ruby-forum.com/u/Juan_Q)\
**Post date:** [July 8, 2010, 1:11am UTC](https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243/1 "2010-07-08T01:11:42Z")

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I have installed deb package of GNU radio 3.2.2 for Ubuntu 9.04 and  
works fine, with openSUSE 11.1 I try tarball and everything is OK, for  
openSUSE there’s a rpm package of GNU radio 3.1.3 avalaible in  
[Search](http://software.opensuse.org/search) it’s ok too.

Try doing this step by step  
Run tunnel.py, in Ubuntu sudo tunnel.py -f 24xxe6 -c x x can be whatever  
you want.

You will see an output asking to allocate gr0

Set an IP address with sudo ifconfig gr0 192.168.200.1 netmask  
255.255.255.0, don’t press enter

Wait here and go to next PC and repeat the same, but press enter when  
both PCs are ready

If everything is fine immediately in console you will see RX and TX  
because of communication is beginning, is there’s only TX messages we  
have a problem, if BBBB is in your screen, it means back off no carrier  
sensed, try to change it with -c option.

Again good luck

Juan Q.

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<div class="post-metadata">

**Author:** ![Juan\_Q](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/c57346/32.png) [@Juan\_Q](https://www.ruby-forum.com/u/Juan_Q)\
**Post date:** [July 8, 2010, 4:30pm UTC](https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243/2 "2010-07-08T16:30:07Z")

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Juan,

Thanks a lot for your response. I tried stopping at the ifconfig stage  
and  
wait for both PCs to be ready before hitting enter. But all I saw was TX  
and  
no RX. Do you have any idea where the problem might be?

Tuan

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**Author:** ![Juan\_Q](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/c57346/32.png) [@Juan\_Q](https://www.ruby-forum.com/u/Juan_Q)\
**Post date:** [July 8, 2010, 4:42pm UTC](https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243/3 "2010-07-08T16:42:25Z")

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Hi,  
I have successfully run digital folders tunnel.py.  
However, I am not receiving anything when i run the ofdm folder  
tunnel.py.  
Whereas the benchmark\_ofdm\_tx+rx.py is running perfectly.  
I have varied almost all the available parameters but to no avail.  
Please help me out.  
Thanks in advance.  
Chuck.

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**Author:** ![Juan\_Q](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/c57346/32.png) [@Juan\_Q](https://www.ruby-forum.com/u/Juan_Q)\
**Post date:** [July 8, 2010, 4:50pm UTC](https://www.ruby-forum.com/t/re-help-required-tunnel-py/191243/4 "2010-07-08T16:50:36Z")

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Chuck,

What hardware are you using?