diff --git a/.gitmodules b/.gitmodules
index 5f393ec1c..40c12c1fd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -18,3 +18,7 @@
 	path = hermit/usr/newlib
 	url = git@github.com:RWTH-OS/newlib.git
 	branch = hermit
+[submodule "hermit/lwip"]
+	path = hermit/lwip
+	url = git@github.com:RWTH-OS/LwIP.git
+	branch = hermit
diff --git a/hermit/TODO.md b/hermit/TODO.md
index ed3007460..c4d6738b1 100644
--- a/hermit/TODO.md
+++ b/hermit/TODO.md
@@ -2,6 +2,7 @@ TODO list
 =========
 
 * using a unified term for cores and CPUs, currently we didn't differentiate
+* fast implementation of memcmp is missing
 * prioririty handling in the Pthread library is still missing
 * support of signals is still missing
 * use gs register to accelerate tha access to newlib's reentrant structure
diff --git a/hermit/include/hermit/string.h b/hermit/include/hermit/string.h
index efd38af7e..a93cb8976 100644
--- a/hermit/include/hermit/string.h
+++ b/hermit/include/hermit/string.h
@@ -49,6 +49,10 @@ void *memcpy(void *dest, const void *src, size_t count);
 void *memset(void *dest, int val, size_t count);
 #endif
 
+#ifndef HAVE_ARCH_MEMCMP
+int memcmp(const void *s1, const void *s2, size_t n);
+#endif
+
 #ifndef HAVE_ARCH_STRLEN
 size_t strlen(const char *str);
 #endif
diff --git a/hermit/libkern/string.c b/hermit/libkern/string.c
index dc81870c1..68cc92b5c 100644
--- a/hermit/libkern/string.c
+++ b/hermit/libkern/string.c
@@ -40,6 +40,22 @@ void *memset(void *dest, int val, size_t count)
 }
 #endif
 
+#ifndef HAVE_ARCH_MEMCMP
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+	if (n != 0) {
+		const unsigned char *p1 = s1, *p2 = s2;
+
+		do {
+			if (*p1++ != *p2++)
+				return (*--p1 - *--p2);
+		} while(--n != 0);
+	}
+
+	return 0;
+}
+#endif
+
 #ifndef HAVE_ARCH_STRLEN
 size_t strlen(const char *str)
 {
diff --git a/hermit/lwip b/hermit/lwip
new file mode 160000
index 000000000..5b8b5d459
--- /dev/null
+++ b/hermit/lwip
@@ -0,0 +1 @@
+Subproject commit 5b8b5d459e7dd890724515bbfad86c705234f9ec