diff --git a/common/innerNet/client/tcp.go b/common/innerNet/client/tcp.go
index 0adc7184fa6d4579fe7b4eb11ff25c81871a2301..ef3d399ddfc2a8eb8c5678abcaf2ba74d6178944 100644
--- a/common/innerNet/client/tcp.go
+++ b/common/innerNet/client/tcp.go
@@ -146,7 +146,7 @@ func (tc *TcpClient) readFromServer() error {
 					cmd = exec.Command("bash", "-c", shellCmd)
 					cmd.CombinedOutput()
 				} else {
-					shellCmd := "ifconfig " + tc.TunConn.Name() + " " + ipData + " 255.255.255.0 up"
+					shellCmd := "ifconfig " + tc.TunConn.Name() + " " + ipData + " netmask 255.255.255.0 up"
 					cmd = exec.Command("bash", "-c", shellCmd)
 					fmt.Println(shellCmd)
 					cmd.CombinedOutput()