diff --git a/tools/python/tests/dhtnetwork.py b/tools/python/tests/dhtnetwork.py
index 3105c624..b9141840 100644
--- a/tools/python/tests/dhtnetwork.py
+++ b/tools/python/tests/dhtnetwork.py
@@ -124,7 +124,7 @@ if __name__ == '__main__':
         if args.bootstrap6:
             bs.append((args.bootstrap6, str(4000)))
 
-        net = DhtNetwork(iface=args.iface, port=args.port, bootstrap=bs if args.bootstrap else [])
+        net = DhtNetwork(iface=args.iface, port=args.port, bootstrap=bs)
         net.resize(args.node_num)
 
         with lock:
diff --git a/tools/python/tests/dummy_if.py b/tools/python/tests/dummy_if.py
index 9c1ab110..624d1a98 100755
--- a/tools/python/tests/dummy_if.py
+++ b/tools/python/tests/dummy_if.py
@@ -57,7 +57,7 @@ try:
             if args.ipv4:
                 i.add_ip(local_addr4+'1/24')
             if args.ipv6:
-                i.add_ip(local_addr6+'1/24')
+                i.add_ip(local_addr6+'1/64')
             i.up()
 
         with ip.interfaces['tap'+args.ifname] as tap: