diff --git a/defaults/main.yml b/defaults/main.yml
index 79bdcff..a2c922c 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -242,7 +242,7 @@ dhcpd_subnet_default:
     routers: '{{ ansible_default_ipv4.gateway | default("") }}'
     comment: 'Generated automatically by Ansible'
   '6':
-    subnet: '{{ ansible_default_ipv6.address + "/" + ansible_default_ipv6.prefix }}'
+    subnet: '{{ ansible_default_ipv6.address|default("::1") + "/" + ansible_default_ipv6.prefix }}'
     comment: 'Generated automatically by Ansible'
 
 
@@ -270,7 +270,7 @@ dhcpd_failovers: []
 # .. envvar:: dhcpd_probe
 #
 # Enable or disable ``dhcp-probe`` script
-dhcpd_probe: True
+dhcpd_probe: False
 
 
 # .. envvar:: dhcpd_probe_mail_to