Hello all,

I meet some streaming issues with a USRP N310 I'd like to further
investigate.

Currently I am only using a 1Gb link with the SFP0 port. I set up the
network config following this :
https://kb.ettus.com/USRP_N300/N310/N320/N321_Getting_Started_Guide#Setting_Up_a_Streaming_Connection

It is recommended to set a MTU of 1500 on the SFP0 interface, so I
configured the Ethernet interface on the host PC accordingly.
When I check the MTU on the N310, it is set by default to 9000 on the SFP0
interface.
If I try to change it using ifconfig, it tells that the resource is busy
and in any case it's not permanent in the command line.

So I edited the network configuration files as described here :
https://kb.ettus.com/USRP_N300/N310/N320/N321_Getting_Started_Guide#Updating_the_Network_Configurations
On the N310, I created a file sfp0.network in /etc/systemd/network with
this content :

[Match]
Name=sfp0

[Network]
Address=192.168.10.2/24

[Link]
MTUBytes=1500

deleted the ~residual files from vi, and ran : systemctl restart
systemd-networkd

But it doesn't seem to change the default settings afterwards or whenever
the USRP N310 is restarted.
How can I set the MTU for a 1Gb link on the N310 sfp0 interface ?

Thanks for any suggestion!

Anthony
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