systemd-networkd has this option in systemd.network
RequestBroadcast=
Request the server to use broadcast messages before the IP address
has been
configured. This is necessary for devices that cannot receive RAW
packets, or
that cannot receive packets at all before an IP address has been
configured. On
the other hand, this must not be enabled on networks where
broadcasts are
filtered out.
I wonder if in addition to netplan.yaml, one could manually create
/etc/systemd/network/NETPLAN_GENERATED_NETWORK_NAME.network.d/ directory
and drop in there 30-request-broadcast.conf
[DHCPv4]
RequestBroadcast=yes
I wonder if that will make "everything work"
Note that indeed this will only work for installed systems to
communicate with each other. This will not work from the initrd to
netboot the installer (aka ip=dhcp url=http://url/to/server-live.iso).
I am slightly perplexed about this option. Is it possible to detect that
interface is a hypersocket in L3? Shouldn't systemd-networkd default to
RequestBroadcast=yes for such interfaces? Imho it would be not neat that
one has to manually specify request-broadcast: true in netplan yaml.
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https://bugs.launchpad.net/bugs/1914740
Title:
IPs are not assigned for Hipersockets in DHCP mode
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