I did some more experiments, but without results…

Just to answer your last, the USRP is connected directly to the NIC (no 
switches).

```
abusso@ttclabsdr:~$ sudo ethtool enp4s0f0
Settings for enp4s0f0:
        Supported ports: [ FIBRE ]
        Supported link modes:   10000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  10000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Full
        Port: Direct Attach Copper
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: g
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes
```

Since there are two 10GBit connections, I tried the programming using one or 
the other, but result is the same. So, I do not think it is a problem of cable 
or SFP+ adapter.

I checked with wireshark what is going on, and the result is that there is an 
exchange of 72 UDP packets of short length (16 bytes) from PC to USRP, each 
followed by a reply of 16 bytes, and the communication terminates with a longer 
one from PC (272 bytes) followed by 4 bytes reply from USRP. So, it seems not 
much data is transferred and the real image transfer never starts.

The packets are not all the same, so something seems going on, but I have the 
impression that the last one creates some problems. For the first 72, the 
answer is quite immediate (20-30us), but the last reply from USRP takes almost 
1 second. 

If needed, I can attach the wireshark extrack.

```
```
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