From bd03abae8b9aff8f0e7ab7f8c60b1cfa0c5d347c Mon Sep 17 00:00:00 2001
From: xiehang <xiehang@espressif.com>
Date: Wed, 3 Jun 2020 16:54:28 +0800
Subject: [PATCH] Change the default value of TCP_MSS to 1440 and TCP_MSS Range
 : [536 1460]

---
 components/lwip/Kconfig | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/components/lwip/Kconfig b/components/lwip/Kconfig
index cebc118476..b540bd76e2 100644
--- a/components/lwip/Kconfig
+++ b/components/lwip/Kconfig
@@ -295,12 +295,15 @@ config TCP_SYNMAXRTX
 
 config TCP_MSS
     int "Maximum Segment Size (MSS)"
-    default 1436
-    range 1220 1436
+    default 1440
+    range 536 1440
     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)"