diff --git a/core/net/mac/nullmac.c b/core/net/mac/nullmac.c
new file mode 100644
index 000000000..a3aceedae
--- /dev/null
+++ b/core/net/mac/nullmac.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: nullmac.c,v 1.1 2007/05/15 07:40:22 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A MAC protocol that does not do anything.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#include "net/mac/nullmac.h"
+
+static const struct radio_driver *radio;
+
+/*---------------------------------------------------------------------------*/
+static void
+send(void)
+{
+  radio->send(rimebuf_hdrptr(), rimebuf_totlen());
+}
+/*---------------------------------------------------------------------------*/
+static void
+input(void)
+{
+  int len;
+  rimebuf_clear();
+  len = radio->read(rimebuf_dataptr(), RIMEBUF_SIZE);
+  rimebuf_set_datalen(len);
+  rime_input();
+}
+/*---------------------------------------------------------------------------*/
+void
+nullmac_init(const struct radio_driver *d)
+{
+  rime_set_output(send);
+  radio = d;
+  radio->set_receive_function(input);
+  radio->on();
+}
+/*---------------------------------------------------------------------------*/
diff --git a/core/net/mac/nullmac.h b/core/net/mac/nullmac.h
new file mode 100644
index 000000000..a00582f55
--- /dev/null
+++ b/core/net/mac/nullmac.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: nullmac.h,v 1.1 2007/05/15 07:40:22 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A MAC protocol implementation that does not do anything.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __NULLMAC_H__
+#define __NULLMAC_H__
+
+#include "contiki-net.h"
+
+#include "dev/radio.h"
+
+void nullmac_init(const struct radio_driver *d);
+
+#endif /* __NULLMAC_H__ */