On Thu, Dec 21, 2023 at 04:51:37PM +0000, Gary Buhrmaster wrote: > On Wed, Dec 20, 2023 at 7:51 PM Chris Adams <linux@xxxxxxxxxxx> wrote: > > > > Once upon a time, Aoife Moloney <amoloney@xxxxxxxxxx> said: > > > Enable IPv4 Address Conflict Detection by default in NetworkManager. > > > > Huh, I didn't realize NM didn't already do this... ye olde > > network-scripts did. > > > > > As I recall, depending on configuration(s), > systemd-networkd has done so for quite > some time. Off hand I do not recall its > various values, but it might make sense > to align the settings. systemd-networkd supports DAD for both static and dynamic addresses, and it's disabled by default. For static addresses, DAD must be enabled via: [Address] Address=192.168.1.1/24 DuplicateAddressDetection=ipv4 For DHCP, it is enabled by setting Dhcpv4.SendDecline=true In both cases, the maximum timeout is the one from RFC 5227 (9 seconds) and it's not configurable. I have filed an issue to make the value configurable: https://github.com/systemd/systemd/issues/30724 Beniamino
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