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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