update mac syntax

_modules/net.py

@@ -2,8 +2,8 @@ import logging
 
 # compose mac for interfaces
 def clientbr_mac(domain_id, host_id):
-    return ":".join(['DA', 'FF', str(domain_id).zfill(2), '00', str(host_id), '04'])
+    return ":".join(['FA', 'FF', str(domain_id).zfill(2), '00', str(host_id), '04'])
 
 def batadv_mac(domain_id, host_id):
-    return ":".join(['DA', 'FF', str(domain_id).zfill(2), '00', str(host_id), '02'])
+    return ":".join(['FA', 'FF', str(domain_id).zfill(2), '00', str(host_id), '02'])