diff --git a/utils/he_ipv6/ra.py b/utils/he_ipv6/ra.py
index 2b5591e..03b1bf9 100644
--- a/utils/he_ipv6/ra.py
+++ b/utils/he_ipv6/ra.py
@@ -137,6 +137,10 @@ class RADVD(RA):
     tpl_name = 'radvd.conf.j2'
 
     def __init__(self, conf = None, tpl_name = None, tpl_dir = None):
+        if not conf:
+            conf = self.conf
+        if not tpl_name:
+            tpl_name = self.tpl_name
         super().__init__(conf = conf, tpl_name = tpl_name, tpl_dir = tpl_dir)
         self.conf.ext_init()
 
@@ -147,5 +151,9 @@ class DNSMasq(RA):
     tpl_name = 'dnsmasq.include.j2'
 
     def __init__(self, conf = None, tpl_name = None, tpl_dir = None):
+        if not conf:
+            conf = self.conf
+        if not tpl_name:
+            tpl_name = self.tpl_name
         super().__init__(conf = conf, tpl_name = tpl_name, tpl_dir = tpl_dir)
         self.conf.ext_init()