# Connection fails, No UHD Devices Found

**URL:** <https://www.ruby-forum.com/t/connection-fails-no-uhd-devices-found/238055>\
**Category:** GNU Radio\
**Created:** [December 14, 2013, 12:42pm UTC](https://www.ruby-forum.com/t/connection-fails-no-uhd-devices-found/238055 "2013-12-14T12:42:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [December 14, 2013, 12:42pm UTC](https://www.ruby-forum.com/t/connection-fails-no-uhd-devices-found/238055/1 "2013-12-14T12:42:45Z")

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It is very annoying that sometimes I can not connect to the device using  
this command:

~$ sudo ifconfig eth0 192.168.10.1

I can ping 192.168.10.1, but ping 192.168.10.2 fails:

~$ sudo ifconfig eth0 192.168.10.1  
~$ ping 192.168.10.2  
PING 192.168.10.2 (192.168.10.2) 56(84) bytes of data.  
From 192.168.10.1 icmp\_seq=1 Destination Host Unreachable  
From 192.168.10.1 icmp\_seq=2 Destination Host Unreachable  
From 192.168.10.1 icmp\_seq=3 Destination Host Unreachable  
~$ uhd\_find\_devices  
linux; GNU C++ version 4.7.3; Boost\_104900; UHD\_003.006.000-0-g7788c692  
No UHD Devices Found

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<div class="post-metadata">

**Author:** ![nesazeri](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/e19adc/32.png) [@nesazeri](https://www.ruby-forum.com/u/nesazeri)\
**Post date:** [December 16, 2013, 9:04am UTC](https://www.ruby-forum.com/t/connection-fails-no-uhd-devices-found/238055/2 "2013-12-16T09:04:16Z")

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This is almost always caused by network-manager “managing” your device.  
A simple solution is to first stop NM:  
service network-manager stop  
and then configuring your device as you did.

Also, you can try to configure network-manager to assign a static IP  
to your eth0 interface. Just combining manual methods (ifconfig) and  
automatism (network-manager) usually fails, because network-manager is  
not quite respectful towards user-established links.

Greetings  
Marcus

On 14.12.2013 12:41, Nasi wrote:

> icmp\_seq=1 Destination Host Unreachable From 192.168.10.1  
> icmp\_seq=2 Destination Host Unreachable From 192.168.10.1  
> icmp\_seq=3 Destination Host Unreachable ~$ uhd\_find\_devices linux;  
> GNU C++ version 4.7.3; Boost\_104900; UHD\_003.006.000-0-g7788c692 No  
> UHD Devices Found
> 
> * * *

Ubuntu 13.04, gnuradio 3.7, usrp N200

> * * *

Why does it happen?

> How can I connect to USRP device?
> 
> Thanks in advance!
> 
> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio  
> mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

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