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47724fc77c
Both options were introduced in systemd v243[1]. Those options can be
used to ensure that LinkLocalAddressing is only configured for a given
interface if DHCPv4 fails. To quote `systemd.network(5)`:
```
If "fallback" or "ipv4-fallback" is specified, then an IPv4
link-local address is configured only when DHCPv4 fails. If "fallback", an IPv6 link-local
address is always configured, and if "ipv4-fallback", the address is not configured. Note
that, the fallback mechanism works only when DHCPv4 client is enabled, that is, it requires
"DHCP=yes" or "DHCP=ipv4".
```
[1]
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.. | ||
config | ||
hardware | ||
i18n/input-method | ||
installer | ||
misc | ||
profiles | ||
programs | ||
security | ||
services | ||
system | ||
tasks | ||
testing | ||
virtualisation | ||
module-list.nix | ||
rename.nix |