diff --git a/.gitmodules b/.gitmodules
index f12681b6b7..254dabf02c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,3 +5,6 @@
 [submodule "lib/libffi"]
 	path = lib/libffi
 	url = https://github.com/atgreen/libffi
+[submodule "lib/lwip"]
+	path = lib/lwip
+	url = http://git.savannah.gnu.org/r/lwip.git
diff --git a/lib/lwip b/lib/lwip
new file mode 160000
index 0000000000..5b8b5d459e
--- /dev/null
+++ b/lib/lwip
@@ -0,0 +1 @@
+Subproject commit 5b8b5d459e7dd890724515bbfad86c705234f9ec