Fedora 41, same IP on the wired and wifi interfaces no more possible

[Francis.Montagnac@xxxxxxxx]

Hi.

For years, we are using (not at the same time) the same IP on the
wired and wifi interfaces on our laptops.

For Fedora-40 it was necessary to configure NetworkManager with:

    [connection-dad-default]
    ipv4.dad-timeout=0

Ref: https://fedoraproject.org/wiki/Releases/40/ChangeSet#Enable_IPv4_Address_Conflict_Detection_by_default

For Fedora-41, although this option is still valid, this doesn't work
any more: when bringing up the wifi interface, the authentication and
DHCP succeed but even the gateway is unreachable: no answer to ping.

Any idea ?

Thanks.

Traces (anonymised):

nmcli --ask connection up WIFI
<snip>
Connection successfully activated (D-Bus active <snip>

ip route
default via a.b.c.254 dev wlan0 proto dhcp src a.b.c.92 metric 600 
a.b.c.0/20 dev wlan0 proto kernel scope link src a.b.c.92 metric 600 

ping -c 3 a.b.c.254
PING a.b.c.254 (a.b.c.254) 56(84) bytes of data.