That’s a link-local connection which you can replicate like this:
nmcli connection delete ethernet
nmcli connection add type ethernet ipv4.method link-local
nmcli connection up ethernet
If the problem persists, allow the LLMNR client:
sudo firewall-cmd --permanent --add-service=llmnr-client
sudo firewall-cmd --reload
In addition, make sure to enable link-local on the NAS and verify that the source and destination IPs are in the same subnet 169.254.0.0/16.
If this is not possible, you have the following options:
- Use IPv6 link-local assuming the NAS supports IPv6.
- Switch to a static or shared IPv4 connection.
That IP belongs to the Wi-Fi network and makes your traffic routed exclusively over Wi-Fi.
In this case, Ethernet is not used, unless the NAS has some other IP.
See also: