diff --git a/lib/config.coffee b/lib/config.coffee
index d91c9bd..d6250bf 100644
--- a/lib/config.coffee
+++ b/lib/config.coffee
@@ -43,7 +43,7 @@ options = {
   FS_PORT : {type : 'int', default : 7567},
   FS_INTERFACE : {type : 'string', default : '0.0.0.0'},
   FS_SSL : {type : 'bool', default : false},
-  FS_IP : {type : 'string', default : '192.168.0.1'},
+  FS_HOSTNAME : {type : 'string', default : 'acs.example.com'},
   FS_LOG_FILE : {type: 'path', default : ''},
   FS_ACCESS_LOG_FILE : {type : 'path', default : ''},
 
@@ -98,6 +98,9 @@ setConfig = (name, value, commandLineArgument) ->
   if name in ['XML_PARSE_RECOVER', 'xml-parse-recover']
     setConfig('XML_RECOVER', value)
 
+  if name in ['FS_IP', 'fs-ip']
+    setConfig('FS_HOSTNAME', value)
+
   cast = (val, type) ->
     switch type
       when 'int'
diff --git a/lib/cwmp.coffee b/lib/cwmp.coffee
index 9391eb3..5f54f2e 100644
--- a/lib/cwmp.coffee
+++ b/lib/cwmp.coffee
@@ -503,10 +503,10 @@ sendAcsRequest = (sessionContext, id, acsRequest) ->
   if acsRequest.name is 'Download'
     if not acsRequest.url?
       FS_PORT = config.get('FS_PORT')
-      FS_IP = config.get('FS_IP')
+      FS_HOSTNAME = config.get('FS_HOSTNAME')
       FS_SSL = config.get('FS_SSL')
       acsRequest.url = if FS_SSL then 'https://' else 'http://'
-      acsRequest.url += FS_IP
+      acsRequest.url += FS_HOSTNAME
       acsRequest.url += ":#{FS_PORT}" if FS_PORT != 80
       acsRequest.url += "/#{encodeURIComponent(acsRequest.fileName)}"