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Starting from systemd v245, Duplicate Address Detection (DAD) is automatically
enabled for static IPv4 addresses if the IP address is a link local address.
DuplicateAddressDetection=none (or DuplicateAddressDetection=true for historical
reasons) deactivates this.
Important notes on compatibility:
- systemd v243.2 (Yocto release zeus) does not support DuplicateAddressDetection=none
and errors out without applying the IPv4 address -> use the historical
parameter DuplicateAddressDetection=true to remain backward compatibility
- systemd v250.5 (Yocto release kirkstone) ignores the DuplicateAddressDetection=none
(or DuplicateAddressDetection=true) parameter for link local addresses and enables
DAD unconditionally. This is fixed by commit a9efd16090baee492e9dd9ae832b5b548e7c6fcf
("network: do not enable IPv4 ACD for IPv4 link-local address if ACD is disabled explicitly")
which is not part of default Yocto systemd v250.5. In meta-ettus we have applied
the patch so that the DuplicateAddressDetection=none (or DuplicateAddressDetection=true)
parameter is honored for link local addresses
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| sysctl | ||
| system | ||
| udev | ||
| CMakeLists.txt | ||