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diff --git a/isisd/iso_checksum.h b/isisd/iso_checksum.h
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+/*
+ * IS-IS Rout(e)ing protocol - iso_checksum.c
+ *                             ISO checksum related routines
+ *
+ * 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_ISO_CSUM_H
+#define _ZEBRA_ISO_CSUM_H
+
+int iso_csum_verify (u_char *buffer, int len, uint16_t *csum);
+u_int16_t iso_csum_create (u_char *buffer, int len, u_int16_t n);
+
+#endif /* _ZEBRA_ISO_CSUM_H */