diff --git a/common/fddi.c b/common/fddi.c
new file mode 100644
index 00000000..4c03b14c
--- /dev/null
+++ b/common/fddi.c
@@ -0,0 +1,102 @@
+/* fddi.c
+
+   Packet assembly code, originally contributed by Archie Cobbs. */
+
+/*
+ * Copyright (c) 1996-2000 Internet Software Consortium.
+ * 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 Internet Software Consortium 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 INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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 software has been written for the Internet Software Consortium
+ * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
+ * To learn more about the Internet Software Consortium, see
+ * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
+ * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
+ * ``http://www.nominum.com''.
+ */
+
+#ifndef lint
+static char copyright[] =
+"$Id: fddi.c,v 1.1 2000/03/24 00:21:17 mellon Exp $ Copyright (c) 1996-2000 The Internet Software Consortium.  All rights reserved.\n";
+#endif /* not lint */
+
+#include "dhcpd.h"
+
+#ifdef DEC_FDDI
+#include <netinet/if_fddi.h>
+#include <net/if_llc.h>
+
+#if defined (PACKET_ASSEMBLY)
+/* Assemble an hardware header... */
+
+void assemble_fddi_header (interface, buf, bufix, to)
+	struct interface_info *interface;
+	unsigned char *buf;
+	unsigned *bufix;
+	struct hardware *to;
+{
+	struct fddi_header   fh;
+	struct llc     lh;
+
+	if (to && to -> hlen == 7)
+		memcpy (fh.fddi_dhost, &to -> hbuf [1],
+			sizeof (fh.fddi_dhost));
+	memcpy (fh.fddi_shost,
+		&interface -> hw_address.hbuf [1], sizeof (fh.fddi_shost));
+	fh.fddi_fc = FDDIFC_LLC_ASYNC;
+	memcpy (&buf [*bufix], &fh, sizeof fh);
+	*bufix += sizeof fh;
+
+	lh.llc_dsap = LLC_SNAP_LSAP;
+	lh.llc_ssap = LLC_SNAP_LSAP;
+	lh.llc_un.type_snap.control = LLC_UI;
+	lh.llc_un.type_snap.ether_type = eh.ether_type;
+	memcpy (&buf [*bufix], &lh, LLC_SNAP_LEN);
+	*bufix += LLC_SNAP_LEN;
+}
+#endif /* PACKET_ASSEMBLY */
+
+#ifdef PACKET_DECODING
+/* Decode a hardware header... */
+
+ssize_t decode_fddi_header (interface, buf, bufix, from)
+     struct interface_info *interface;
+     unsigned char *buf;
+     unsigned bufix;
+     struct hardware *from;
+{
+	struct fddi_header   fh;
+	struct llc     lh;
+	
+	from -> hbuf [0] = HTYPE_FDDI;
+	memcpy (&from -> hbuf [1], fh.fddi_shost, sizeof fh.fddi_shost);
+	return FDDI_HEADER_SIZE + LLC_SNAP_LEN;
+}
+#endif /* PACKET_DECODING */
+#endif /* DEC_FDDI */