diff --git a/lwip/lwip b/lwip/lwip
index 9452af9..666a818 160000
--- a/lwip/lwip
+++ b/lwip/lwip
@@ -1 +1 @@
-Subproject commit 9452af922fa8a5cb069251a6d284a02f2e6eef60
+Subproject commit 666a818a5d595db0d2bf42fb6e2992a2c80ef544