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base repository: NixOS/nixpkgs
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Commits on Oct 28, 2019

  1. nixos/networkd: add ipv4-fallback and fallback as valid options t… 

    …o `LinkLocalAddressing`

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] systemd/systemd@8bc17bb

(cherry picked from commit 47724fc)
    @Ma27
    Ma27 committed Oct 28, 2019
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