diff --git a/ospf6d/ospf6_proto.h b/ospf6d/ospf6_proto.h
new file mode 100644
index 0000000..9a95444
--- /dev/null
+++ b/ospf6d/ospf6_proto.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 1999 Yasuhiro Ohara
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the 
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 
+ * Boston, MA 02111-1307, USA.  
+ */
+
+#ifndef OSPF6_PROTO_H
+#define OSPF6_PROTO_H
+
+/* OSPF protocol version */
+#define OSPF6_VERSION		3
+
+/* OSPF protocol number. */
+#ifndef IPPROTO_OSPFIGP
+#define IPPROTO_OSPFIGP         89
+#endif
+
+/* TOS field normaly null */
+#define OSPF6_TOS_VALUE               0x0
+
+/* Architectural Constants */
+#define OSPF6_LS_REFRESH_TIME         1800       /* 30 min */
+#define OSPF6_MIN_LS_INTERVAL         5
+#define OSPF6_MIN_LS_ARRIVAL          1
+#define MAXAGE                  3600       /* 1 hour */
+#define CHECK_AGE               300        /* 5 min */
+#define MAX_AGE_DIFF            900        /* 15 min */
+#define LS_INFINITY             0xffffff   /* 24-bit binary value */
+#define INITIAL_SEQUENCE_NUMBER 0x80000001 /* signed 32-bit integer */
+#define MAX_SEQUENCE_NUMBER     0x7fffffff /* signed 32-bit integer */
+
+#define MAXOSPFMESSAGELEN         4096
+
+#define ALLSPFROUTERS6 "ff02::5"
+#define ALLDROUTERS6   "ff02::6"
+
+/* Configurable Constants */
+
+#define DEFAULT_HELLO_INTERVAL    10
+#define DEFAULT_ROUTER_DEAD_TIMER 40
+
+/* OSPF options */
+/* present in HELLO, DD, LSA */
+#define OSPF6_OPT_SET(x,opt)   ((x)[2] |=  (opt))
+#define OSPF6_OPT_ISSET(x,opt) ((x)[2] &   (opt))
+#define OSPF6_OPT_CLEAR(x,opt) ((x)[2] &= ~(opt))
+#define OSPF6_OPT_CLEAR_ALL(x) ((x)[0] = (x)[1] = (x)[2] = 0)
+
+#define OSPF6_OPT_V6 (1 << 0)   /* IPv6 forwarding Capability */
+#define OSPF6_OPT_E  (1 << 1)   /* AS External Capability */
+#define OSPF6_OPT_MC (1 << 2)   /* Multicasting Capability */
+#define OSPF6_OPT_N  (1 << 3)   /* Handling Type-7 LSA Capability */
+#define OSPF6_OPT_R  (1 << 4)   /* Forwarding Capability (Any Protocol) */
+#define OSPF6_OPT_DC (1 << 5)   /* Demand Circuit handling Capability */
+
+char *
+ospf6_options_string (u_char opt_capability[3], char *buffer, int size);
+
+#endif /* OSPF6_PROTO_H */
+