You can only have one service managing any particular network device. So, if you install dhcpcd5 you need to at least disable NetworkManager (and whatever other services go with it).I am setting up some point-to-point connection from Pi5 (running bookworm) to a another PC (Windows), I want the connection to get LLA automatically without setting Link-Local Only IPv4 configuration.
I tested in a separate Ubuntu VM and DHCP -> LLA fallback works.
I was able to make it work by installing dhcpcd5 and running dhcpcd.service, however it breaks NetworkManager and after a reboot, Pi wont boot to desktop, and I have to restore the desktop environment.
Any clues on this?
I believe on Pi, it runs dhclient but now sure if dhclient is able to fallback to LLA.
But, thagrol pointed you to his document that should be very helpful for you.
Also, if you're into a bit of experimentation, you can continue using NetworkManager and fiddle around with the setting ipv4.link-local for your eth0 connection. According to the NetworkManager docs it can take the values: default (0), auto (1), disabled (2), enabled (3), fallback (4)
I just discovered this today, so I haven't tried it yet. If you try it and does what you want/expect, please report back here for others.
EDIT: Tried it, didn't do what I thought it would. Sorry for the distraction!
Statistics: Posted by bls — Wed May 21, 2025 10:27 pm