diff --git a/src/types.h b/src/types.h
new file mode 100644
index 0000000..f039b7b
--- /dev/null
+++ b/src/types.h
@@ -0,0 +1,11 @@
+#include <stdint.h>
+
+#ifndef TYPES_H_
+#define TYPES_H_
+typedef uint32_t ipaddr_n_t; // IPv4 address network order
+typedef uint32_t ipaddr_h_t; // IPv4 address host order
+typedef uint16_t port_n_t; // port network order
+typedef uint16_t port_h_t; // port host order
+typedef unsigned char macaddr_t;
+
+#endif