SLAAC previously set 'auto' which is not supported by nocloud network
config. On an up-to-date Ubuntu this should work as it uses 'dhcp' for
both dhcp and SLAAC. For others it was invalid anyway.

Signed-off-by: David Limbeck <[email protected]>
---
 PVE/QemuServer/Cloudinit.pm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PVE/QemuServer/Cloudinit.pm b/PVE/QemuServer/Cloudinit.pm
index 53f1de9..5be820c 100644
--- a/PVE/QemuServer/Cloudinit.pm
+++ b/PVE/QemuServer/Cloudinit.pm
@@ -340,6 +340,9 @@ sub nocloud_network {
        if (defined(my $ip = $ipconfig->{ip6})) {
            if ($ip eq 'dhcp') {
                $content .= "${i}- type: dhcp6\n";
+           } elsif ($ip eq 'auto') {
+               # SLAAC is not supported by cloud-init, this fallback should 
work with an up-to-date netplan at least
+               $content .= "${i}- type: dhcp6\n";
            } else {
                $content .= "${i}- type: static\n"
                       . "${i}  address: $ip\n";
-- 
2.11.0


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