--- cloudinit/net/sysconfig.py.orig
+++ cloudinit/net/sysconfig.py
@@ -349,6 +349,7 @@ class Renderer(renderer.Renderer):
                 # TODO need to set BOOTPROTO to dhcp6 on SUSE
                 iface_cfg['IPV6INIT'] = True
                 iface_cfg['DHCPV6C'] = True
+                iface_cfg['DHCLIENT6_MODE'] = 'managed'
             elif subnet_type in ['dhcp4', 'dhcp']:
                 iface_cfg['BOOTPROTO'] = 'dhcp'
             elif subnet_type == 'static':