diff --git a/isisd/isis_network.h b/isisd/isis_network.h
new file mode 100644
index 0000000..7633f9e
--- /dev/null
+++ b/isisd/isis_network.h
@@ -0,0 +1,37 @@
+/*
+ * IS-IS Rout(e)ing protocol - isis_network.h   
+ *
+ * Copyright (C) 2001,2002   Sampo Saaristo
+ *                           Tampere University of Technology      
+ *                           Institute of Communications Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public Licenseas published by the Free 
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc., 
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+
+#ifndef _ZEBRA_ISIS_NETWORK_H
+#define _ZEBRA_ISIS_NETWORK_H
+
+extern u_char ALL_L1_ISYSTEMS[];
+extern u_char ALL_L2_ISYSTEMS[];
+
+int isis_sock_init (struct isis_circuit *circuit);
+
+int isis_recv_pdu_bcast  (struct isis_circuit *circuit, u_char *ssnpa);
+int isis_recv_pdu_p2p  (struct isis_circuit *circuit, u_char *ssnpa);
+int isis_send_pdu_bcast (struct isis_circuit *circuit, int level);
+int isis_send_pdu_p2p (struct isis_circuit *circuit, int level);
+
+#endif /* _ZEBRA_ISIS_NETWORK_H */