From 6f26e72817be82e2b4aac0f967494ef157c0c8c7 Mon Sep 17 00:00:00 2001
From: xiehang <xiehang@espressif.com>
Date: Wed, 3 Jun 2020 17:05:52 +0800
Subject: [PATCH] Change the default value of TCP_MSS to 1440 and TCP_MSS Range
 : [536 1460]

---
 components/lwip/Kconfig | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/components/lwip/Kconfig b/components/lwip/Kconfig
index 586246755..34c21f0ac 100644
--- a/components/lwip/Kconfig
+++ b/components/lwip/Kconfig
@@ -312,12 +312,14 @@ menu "LWIP"
 
         config TCP_MSS
             int "Maximum Segment Size (MSS)"
-            default 1436
-            range 1220 1436
+            default 1440
+            range 536 1436
             help
                 Set maximum segment size for TCP transmission.
 
-                Can be set lower to save RAM, the default value 1436 will give best throughput.
+                Can be set lower to save RAM, the default value 1460(ipv4)/1440(ipv6) will give best throughput.
+                IPv4 TCP_MSS Range: 576 <= TCP_MSS <= 1460
+                IPv6 TCP_MSS Range: 1220<= TCP_MSS <= 1440
 
         config TCP_MSL
             int "Maximum segment lifetime (MSL)"