diff --git a/web/core/mw.py b/web/core/mw.py
index b8254158b..6fbb975e2 100644
--- a/web/core/mw.py
+++ b/web/core/mw.py
@@ -201,6 +201,10 @@ def getCommonFile():
     }
     return data
 
+def getSysTTL():
+    f = "/proc/sys/net/ipv4/ip_default_ttl"
+    return readFile(f).strip()
+
 def checkCert(certPath='ssl/certificate.pem'):
     # 验证证书
     openssl = '/usr/bin/openssl'