[USRP-users] Can ping but not find_device on N210

Aaron Henderson eginehen at hotmail.com
Tue Jul 7 11:55:07 EDT 2015


    
I took your suggestion to change the IP address 10.51.14.0/9 to mean 10.51.14.0 through 10.51.14.9. Since that is not what you meant, can you clarify?
Aaron

Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone

-------- Original message --------
From: "Marcus D. Leech" <mleech at ripnet.com> 
Date: 07/07/2015  10:00 AM  (GMT-06:00) 
To: Aaron Henderson <eginehen at hotmail.com>, usrp-users at lists.ettus.com, neel.pandeya at ettus.com 
Subject: Re: [USRP-users] Can ping but not find_device on N210 


    On 07/07/2015 10:11 AM, Aaron Henderson
      wrote:

    
    
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      With method 2 I gave the following command 'sudo
        ./usrp2_recovery.py --ifc=eth0 --new-ip=10.51.14.1' and got a
        'Done' message, so I take it that the change was succesful, and
        I can ping the device. However, uhd_usrp_probe and
        uhd_find_devices gives the same errors as before.

        

        I have even tried setting the subnet with this command
        './usrp_burn_mb_eeprom --values="subnet=255.255.254.0,
        gateway=10.51.14.1" to no avail.

        

        The positive change is that I can change my IP address now.

        

        Aaron

      
    
    You've  set the address of your N210 to the same as what I assume is
    your local router.  They'll now be fighting.

    

    You can't just pick an address at  random in that situation,  since
    that network  is shared with others, and everyone needs their own
    address, including

      the local  router.

    

    In the case  where you have a *dedicated* link to the USRP, it
    doesn't matter.   But in this case, you're connected to a wider
    network.

    

    
      

        
          Date: Tue, 7 Jul 2015 09:53:59 -0400

          From: mleech at ripnet.com

          To: eginehen at hotmail.com; usrp-users at lists.ettus.com;
          neel.pandeya at ettus.com

          Subject: Re: [USRP-users] Can ping but not find_device on N210

          

          On 07/07/2015 09:46 AM, Aaron
            Henderson wrote:

          
          
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            I am using a 4 port Netgear hub, because, the
              tower I am using has only one ethernet port.

              

              My host PC IP addres is set to 10.51.14.35, and my N210
              has an IP address of the factory default (192.168.10.2)
              with no way to change it.

              

              The results from 'netstat -rn' are:

              Kernel IP routing table

              Destination     Gateway         Genmask         Flags  
              MSS Window  irtt Iface

              0.0.0.0         10.51.14.1      0.0.0.0         UG       
              0 0          0 eth0

              10.51.14.0      0.0.0.0         255.255.254.0   U        
              0 0          0 eth0

              169.254.0.0     0.0.0.0         255.255.0.0     U        
              0 0          0 eth0

              

              Aaron

              

            
          
          OK, so the basic problem is that you have no mutual routing
          between the N210 and  your host PC.  

          

          We don't recommend using a "shared" ethernet port to talk to
          your network-connected USRP devices, they really should be on
          a dedicated port, and  it

            sounds like your one ethernet port is used for your regular
          networking "stuff".

          

          If you use "method 2" here:

          

          http://files.ettus.com/manual/page_usrp2.html#usrp2_network_changeip

          

          You can change the address to an address on your hosts subnet
          (10.51.14.0/9) and that should get you communicating, but you
          won't be able to support

            high-speed operations, likely, due to conflicts  with other
          network traffic.

          

          Ideally, get a 2nd 1GiGe ethernet card, and program it for an
          ip address of 192.168.10.1

          

          

          
            
              
                Date: Tue, 7 Jul 2015 09:42:22
                -0400

                From: mleech at ripnet.com

                To: eginehen at hotmail.com;
                usrp-users at lists.ettus.com;
                neel.pandeya at ettus.com

                Subject: Re: [USRP-users] Can ping but not find_device
                on N210

                

                On 07/07/2015 09:30 AM,
                  Aaron Henderson wrote:

                
                
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                  I am unable to change the IP address of
                    the device.

                    

                    Is there a work around? A better setup or diiferent
                    way to troubleshoot this issue?

                    

                    Aaron

                  
                
                Could you elucidate, once more, your exact setup?

                

                What is the IP address of the host port on your PC that
                you're using?

                What is the IP address of the N210?  Is it the factory
                default of 192.168.10.2 ?

                

                What devices are in between your host PC and the N210?

                

                What does:

                

                netstat  -rn

                

                On your host PC  produce?

                

                

                
                  

                    
                      Date: Mon, 6 Jul 2015
                      10:45:31 -0400

                      To: usrp-users at lists.ettus.com

                      Subject: Re: [USRP-users] Can ping but not
                      find_device on N210

                      From: usrp-users at lists.ettus.com

                      

                      On 07/06/2015
                        10:39 AM, Neel Pandeya via USRP-users wrote:

                      
                      
                        
                          Your
                            host computer and the N210 should be on the
                            same subnet, but with different IP
                            addresses, such as 192.168.10.2/24 and 192.168.10.99/24. The
                            ping uses ICMP Echo, but the
                            uhd_find_devices uses broadcast IP packets.
                            If you have a hub, switch, or router in
                            between the host computer and the N210, then
                            it might be blocking these IP packets. Are
                            you able to run (replace the correct IP
                            address for your N210):

                            

                            uhd_usrp_probe



                              --args="addr=192.168.10.2"

                            

                          
                          --Neel

                            

                          
                          

                          
                        
                      
                      Also, and I've said this in the past.  The 1GiGe
                      port on the USRPs shouldn't be thought of as a
                      general-purpose network port, but as a convenient

                        and cheap "data bus" between you computer and
                      the USRP.  The USRPs don't have a full IP routing
                      stack on them, so the more IP and

                        ethernet-switching "plumbing" that is placed
                      between the USRP and your host computer, the more
                      likely it is that you'll have problems,

                        particularly if you're not familiar with IP
                      network design and configuration.  Further, MANY
                      1GiGe switches apparently cannot sustain high

                        data rates across their switching fabric, and
                      start losing frames when streaming samples from
                      USRPs.

                      

                      

                      
                        

                          On 6 July 2015 at
                            07:29, Aaron Henderson via USRP-users <usrp-users at lists.ettus.com>
                            wrote:

                            
                              
                                Now my N210 is not being
                                  recognized by the hub I am using.

                                  

                                  Does this mean my N210 has gone bad?

                                  

                                  Aaron

                                  

                                  
                                    Date: Mon, 6 Jul 2015 15:24:09
                                    +0200

                                    From: marcus.mueller at ettus.com

                                    To: eginehen at hotmail.com;
                                    USRP-users at lists.ettus.com

                                    Subject: Re: [USRP-users] Can ping
                                    but not find_device on N210

                                    

                                    Hi Aaron,

                                    

                                    the situation is the following: your
                                    PC is in a different subnet than
                                    your USRP, hence the USRP doesn't
                                    know where to send packets to your
                                    PC directly, and tries to send them
                                    to the configured default gateway.
                                    Probably, this doesn't work either
                                    (that gateway probably doesn't
                                    exist).

                                    

                                    The easiest solution to this is
                                    giving your PC an IP address from
                                    the same subnet, e.g. if you're on
                                    linux, a

                                    

                                    sudo ip address add 192.168.10.100
                                    dev eth0 

                                    

                                    (assuming eth0 is the network
                                    interface you want to use)

                                    

                                    Then, add a route through that:

                                    

                                    sudo ip route add 192.168.10.0/24
                                    dev eth0 

                                    

                                    to tell your computer that all
                                    packets for any address in the
                                    192.168.10.* network should directly
                                    go through eth0.

                                    

                                    Best regards,

                                    Marcus

                                    

                                    On 07/06/2015 02:31 PM, Aaron
                                      Henderson wrote:

                                    
                                    
                                      Hotmail was telling
                                        me it wasn't sending, but
                                        obviously it was.

                                        

                                        uhd_usrp_probe offers the same
                                        error, and my PC's IP address is
                                        set to 10.51.14.35.

                                        

                                        Aaron

                                        

                                        
                                          Date: Wed, 1 Jul 2015
                                          18:49:11 +0200

                                          To: usrp-users at lists.ettus.com

                                          Subject: Re: [USRP-users] Can
                                          ping but not find_device on
                                          N210

                                          From: usrp-users at lists.ettus.com

                                          

                                          Hi Aaron,

                                          I got your mail four times, so
                                          maybe there's something wrong
                                          with your mail server?

                                          

                                          Does 

                                          

                                          uhd_usrp_probe --args
                                          "addr=192.168.10.2"

                                          

                                          work?

                                          What is your PC's IP address?

                                          

                                          Best regards,

                                          Marcus

                                          

                                          On 07/01/2015 04:24 PM,
                                            Aaron Henderson via
                                            USRP-users wrote:

                                          
                                          
                                            Hello again
                                              list,

                                              

                                              I am in a different part
                                              of my project and am
                                              running into an issue with
                                              finding my device.

                                              

                                              I have found multiple
                                              listings on the Internet
                                              about this issue but it is
                                              all overwhelming. Meaning
                                              I am not sure which
                                              information will be
                                              beneficial to me or not.

                                              

                                              The steps I have taken so
                                              far are:

                                              1. I have pinged the
                                              device and it is
                                              communicating with the
                                              computer.

                                              2. I have ran
                                              uhd_find_devices and
                                              uhd_usrp_probe(with and
                                              without the IP address as
                                              an arguement), for
                                              uhd_find_devices I get
                                              this error message, 'No
                                              UHD Devices Found', and
                                              for uhd_usrp_probe I get
                                              this error message, 

                                              'Error: LookupError:
                                              KeyError: No devices found
                                              for ----->

                                              Device Address:

                                                  addr: 192.168.10.2'

                                              3. I have disabled my
                                              firewall and still the
                                              same issue persists.

                                              4. I have started in safe
                                              mode and still the same
                                              issue persists.

                                              

                                              Can someone point me to a
                                              reliable webpage with a
                                              similar issue if it
                                              exists, or give me some
                                              pointers?

                                              

                                              Aaron 
                                            

                                            
                                            

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