USRP x310 responds to ping but does not responds to uhd_find_devices or uhd_usrp_probe - gnuradio

Question

I am having some trouble with my USRP x310. This question might seem duplicate but I have already tried all the possible solution that I was able to find but I am still not able to resolve it.
Here are some of the posts that I followed and were similar to the problem I am facing.
1. http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2015-January/040356.html
2. https://www.ruby-forum.com/t/a-strange-problem-with-no-uhd-devices-found-when-ping-192-168-10-2-is-ok/217561
I even posted a question at the NI discussion forum here is the URL, But I haven't received any response. I also tried to make a post at discuss-gnuradio#gnu.org and usrp-users#lists.ettus.com but for some reason the question is not yet posted so now I turnig to the good old trusted stackoverflow in search of some help.
Here is problem I am facing.
I was able to run my USRP x310 without any problem till last week but when I turned it on this week to run some experiments using srsLTE, when I ran srsenb it started gaving error "no compatible rf-frontend found". So to test the connectivity of x310 with the host computer, I ran 'uhd_find_devices' and 'uhd_usrp_probe'
Here is the output of the commands.
raghav#raghav-XPS:~$ uhd_find_devices
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.15.0.0-release
No UHD Devices Found
raghav#raghav-XPS:~$ uhd_usrp_probe
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.15.0.0-release
Error: LookupError: KeyError: No devices found for ----->
Empty Device Address
Then I checked the hardware and I was able to see the sfp+ light at port 0 which is correct, so I tried to ping the x310 'ping 192.168.10.2' and the device responded to ping without any loss in packets. So I tried to run 'uhd_find_devices' and 'uhd_usrp_probe' by providing the address of the device as the argument and then I was able to see the correct output.
Here is the outputs:
raghav#raghav-XPS:~$ uhd_find_devices --args addr=192.168.10.2
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.15.0.0-release
--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
serial: 31EC216
addr: 192.168.10.2
fpga: HG
name:
product: X310
type: x300
raghav#raghav-XPS:~$ uhd_usrp_probe --args addr=192.168.10.2
[INFO] [UHD] linux; GNU C++ version 7.5.0; Boost_106501; UHD_3.15.0.0-release
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 1472 bytes.
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [GPS] No GPSDO found
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1319 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1314 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
_____________________________________________________
/
| Device: X-Series Device
| _____________________________________________________
| /
| | Mboard: X310
| | revision: 11
| | revision_compat: 7
| | product: 30818
| | mac-addr0: 00:80:2f:31:49:67
| | mac-addr1: 00:80:2f:31:49:68
| | gateway: 192.168.10.1
| | ip-addr0: 192.168.10.2
| | subnet0: 255.255.255.0
| | ip-addr1: 192.168.20.2
| | subnet1: 255.255.255.0
| | ip-addr2: 192.168.30.2
| | subnet2: 255.255.255.0
| | ip-addr3: 192.168.40.2
| | subnet3: 255.255.255.0
| | serial: 31EC216
| | FW Version: 6.0
| | FPGA Version: 36.0
| | FPGA git hash: fde2a94
| | RFNoC capable: Yes
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I have already tried to update the fpga of the x310, redid the network connection setup and even reinstalled uhd drivers but nothing helped so far.
I would really appreciate if someone can help me with this issue.

Answer 1

This is a classical case of "computer does not let through traffic from broadcast addresses" as used for device discovery.
Hence, When trying to use my USRP in GNU Radio, I get a " No devices found for ----->" error partially applies. Make sure your PC's firewall is configured to let through packets from and for broadcast addresses.