diff --git a/isisd/include-netbsd/esis.h b/isisd/include-netbsd/esis.h
new file mode 100644
index 0000000..ded864e
--- /dev/null
+++ b/isisd/include-netbsd/esis.h
@@ -0,0 +1,146 @@
+/*	$NetBSD: esis.h,v 1.11 1997/11/03 15:01:19 is Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ *
+ *	@(#)esis.h	8.1 (Berkeley) 6/10/93
+ */
+
+/***********************************************************
+		Copyright IBM Corporation 1987
+
+                      All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of IBM not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+
+/*
+ * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
+ */
+
+#include <machine/endian.h>
+
+#define	SNPAC_AGE		60	/* seconds */
+#define	ESIS_CONFIG		60	/* seconds */
+#define	ESIS_HT			(ESIS_CONFIG * 2)
+
+/*
+ *	Fixed part of an ESIS header
+ */
+struct esis_fixed {
+	u_char          esis_proto_id;	/* network layer protocol identifier */
+	u_char          esis_hdr_len;	/* length indicator (octets) */
+	u_char          esis_vers;	/* version/protocol identifier
+					 * extension */
+	u_char          esis_res1;	/* reserved */
+	u_char          esis_type;	/* type code */
+	/* technically, type should be &='d 0x1f */
+#define ESIS_ESH	0x02	/* End System Hello */
+#define ESIS_ISH	0x04	/* Intermediate System Hello */
+#define ESIS_RD		0x06	/* Redirect */
+	u_char          esis_ht_msb;	/* holding time (seconds) high byte */
+	u_char          esis_ht_lsb;	/* holding time (seconds) low byte */
+	u_char          esis_cksum_msb;	/* checksum high byte */
+	u_char          esis_cksum_lsb;	/* checksum low byte */
+} __attribute__((packed));
+/*
+ * Values for ESIS datagram options
+ */
+#define ESISOVAL_NETMASK	0xe1	/* address mask option, RD PDU only */
+#define ESISOVAL_SNPAMASK	0xe2	/* snpa mask option, RD PDU only */
+#define ESISOVAL_ESCT		0xc6	/* end system conf. timer, ISH PDU
+					 * only */
+
+
+#define	ESIS_CKSUM_OFF		0x07
+#define ESIS_CKSUM_REQUIRED(pdu)\
+	((pdu->esis_cksum_msb != 0) || (pdu->esis_cksum_lsb != 0))
+
+#define	ESIS_VERSION	1
+
+struct esis_stat {
+	u_short         es_nomem;	/* insufficient memory to send hello */
+	u_short         es_badcsum;	/* incorrect checksum */
+	u_short         es_badvers;	/* incorrect version number */
+	u_short         es_badtype;	/* unknown pdu type field */
+	u_short         es_toosmall;	/* packet too small */
+	u_short         es_eshsent;	/* ESH sent */
+	u_short         es_eshrcvd;	/* ESH rcvd */
+	u_short         es_ishsent;	/* ISH sent */
+	u_short         es_ishrcvd;	/* ISH rcvd */
+	u_short         es_rdsent;	/* RD sent */
+	u_short         es_rdrcvd;	/* RD rcvd */
+};
+
+#ifdef	_KERNEL
+struct esis_stat esis_stat;
+struct socket;
+struct mbuf;
+struct snpa_hdr;
+struct clnp_optidx;
+struct iso_addr;
+struct rtentry;
+struct sockaddr_dl;
+
+void esis_init __P((void));
+int esis_usrreq __P((struct socket *, int, struct mbuf *, struct mbuf *,
+		     struct mbuf *, struct proc *));
+void esis_input __P((struct mbuf *, ...));
+void esis_rdoutput __P((struct snpa_hdr *, struct mbuf *, struct clnp_optidx *,
+			struct iso_addr *, struct rtentry *));
+int esis_insert_addr __P((caddr_t *, int *, struct iso_addr *, struct mbuf *,
+			  int));
+void esis_eshinput __P((struct mbuf *, struct snpa_hdr *));
+void esis_ishinput __P((struct mbuf *, struct snpa_hdr *));
+void esis_rdinput __P((struct mbuf *, struct snpa_hdr *));
+void esis_config __P((void *));
+void esis_shoutput __P((struct ifnet *, int, int, caddr_t, int,
+	               struct iso_addr *));
+void isis_input __P((struct mbuf *, ...));
+int isis_output __P((struct mbuf *, ...));
+void *esis_ctlinput __P((int, struct sockaddr *, void *));
+#endif /* _KERNEL */