Hello,

I currently have an issue trying to stream packets through the SFP ports. 
Currently, when I ssh into the Ettus N321 and use ifconfig, I get the following 
output

> eth0      Link encap:Ethernet  HWaddr 00:80:2F:35:25:BE  
>
>           inet addr:192.168.1.151  Bcast:192.168.1.255  Mask:255.255.255.0
>
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>
>           RX packets:108385 errors:211 dropped:0 overruns:96 frame:115
>
>           TX packets:92510 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000 
>
>           RX bytes:57550685 (54.8 MiB)  TX bytes:25439541 (24.2 MiB)
>
>           Interrupt:27 Base address:0xb000 
>
> int0      Link encap:Ethernet  HWaddr 6E:C0:18:F0:B5:B5  
>
>           inet addr:169.254.0.1  Bcast:169.254.0.255  Mask:255.255.255.0
>
>           UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
>
>           RX packets:5342 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:1797 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000 
>
>           RX bytes:5608732 (5.3 MiB)  TX bytes:123539 (120.6 KiB)
>
> lo        Link encap:Local Loopback  
>
>           inet addr:127.0.0.1  Mask:255.0.0.0
>
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>
>           RX packets:116 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:116 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000 
>
>           RX bytes:10067 (9.8 KiB)  TX bytes:10067 (9.8 KiB)
>
> sfp0      Link encap:Ethernet  HWaddr 00:80:2F:35:25:BF  
>
>           inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0
>
>           UP BROADCAST MULTICAST  MTU:9000  Metric:1
>
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000 
>
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> sfp1      Link encap:Ethernet  HWaddr 00:80:2F:35:25:C0  
>
>           inet addr:192.168.20.2  Bcast:192.168.20.255  Mask:255.255.255.0
>
>           UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
>
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>
>           TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
>
>           collisions:0 txqueuelen:1000 
>
>           RX bytes:0 (0.0 B)  TX bytes:5252 (5.1 KiB)

However, when I try to stream through the address port, either sfp0 or sfp1, I 
get the following timeout error

> \[ERROR\] \[RFNOC::MGMT\] EnvironmentError: IOError: Timed out getting recv 
> buff for management transaction
>
> \[ERROR\] \[RFNOC::GRAPH\] IO Error during GSM initialization. 
> EnvironmentError: IOError: Timed out getting recv buff for management 
> transaction
>
> \[ERROR\] \[RFNOC::GRAPH\] Caught exception while initializing graph: 
> EnvironmentError: IOError: Timed out getting recv buff for management 
> transaction

I have double checked my host computer configuration and it appears again that 
I am using the correct configuration. 

When I use “uhd_find_devices"“, it appears the address used for data is the 
same that is used for management, even though my guess is the argument “addr” 
should be either “192.168.10.2” or “192.168.20.2”. I believe this is probably 
related to the error I am receiving, however, I am unsure how to proceed from 
here. The output of uhd_find_devices is as follows…

> --------------------------------------------------
>
> \-- UHD Device 0
>
> \--------------------------------------------------
>
> Device Address:
>
>     serial: 3255102
>
>     addr: 192.168.1.151
>
>     claimed: False
>
>     fpga: HG
>
>     mgmt_addr: 192.168.1.151
>
>     name: ni-n3xx-3255102
>
>     product: n320
>
>     type: n3xx

Thanks

Joe
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