diff --git a/tools/shell/inc/shellInt.h b/tools/shell/inc/shellInt.h
index 382009905c8774b0ff462bcf67f2baa9dd2bbfc2..825866e16361b35ca86abeac62ff5f765ce67a10 100644
--- a/tools/shell/inc/shellInt.h
+++ b/tools/shell/inc/shellInt.h
@@ -62,7 +62,7 @@ typedef struct {
   bool        is_check;
   bool        is_startup;
   bool        is_help;
-  uint16_t    port;
+  int32_t     port;
   int32_t     pktLen;
   int32_t     pktNum;
   int32_t     displayWidth;
diff --git a/tools/shell/src/shellArguments.c b/tools/shell/src/shellArguments.c
index 8ccfde4b16dd591a9535e618f0738e28c68d6332..13f8cde3e3bc43635f92d2c52978a35fef519bbb 100644
--- a/tools/shell/src/shellArguments.c
+++ b/tools/shell/src/shellArguments.c
@@ -99,6 +99,7 @@ static int32_t shellParseSingleOpt(int32_t key, char *arg) {
       break;
     case 'P':
       pArgs->port = atoi(arg);
+      if (pArgs->port == 0) pArgs->port = -1;
       break;
     case 'u':
       pArgs->user = arg;
@@ -304,6 +305,11 @@ static int32_t shellCheckArgs() {
     return -1;
   }
 
+  if (pArgs->port < 0 || pArgs->port > 65535) {
+    printf("Invalid port\n");
+    return -1;
+  }
+
   if (pArgs->pktLen < SHELL_MIN_PKG_LEN || pArgs->pktLen > SHELL_MAX_PKG_LEN) {
     printf("Invalid pktLen:%d, range:[%d, %d]\n", pArgs->pktLen, SHELL_MIN_PKG_LEN, SHELL_MAX_PKG_LEN);
     return -1;