diff --git a/lib/route.sh b/lib/route.sh
index 39f89a3..f99636c 100755
--- a/lib/route.sh
+++ b/lib/route.sh
@@ -96,15 +96,20 @@ for dev in $devs; do
     cmd="${cmd} nexthop dev ${dev}"
 done
 
-# WLAN
-zjuwlan_test_ip=10.202.68.44
-ip route replace $zjuwlan_test_ip via ${gateway}
-zjuwlan_status=`curl -s $zjuwlan_test_ip | grep net.zju.edu.cn | wc -l`
-if [ $zjuwlan_status -eq 0 ]
-then
-    cmd="${cmd} nexthop via ${gateway}"
-fi
-ip route del $zjuwlan_test_ip || true
+case "$gateway" in
+    10.189.*)
+        # WLAN
+        zjuwlan_test_ip=10.202.68.44
+        ip route replace $zjuwlan_test_ip via ${gateway}
+        zjuwlan_status=`curl -s $zjuwlan_test_ip | grep net.zju.edu.cn | wc -l`
+        if [ $zjuwlan_status -eq 0 ]
+        then
+            cmd="${cmd} nexthop via ${gateway}"
+        fi
+        ip route del $zjuwlan_test_ip || true
+        ;;
+esac
+
 $cmd
 ip route