129 lines
3.8 KiB
Groff
129 lines
3.8 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)nsip.4 8.2 (Berkeley) 11/30/93
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.\"
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.Dd November 30, 1993
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.Dt NSIP 4
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.Os BSD 4.3
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.Sh NAME
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.Nm nsip
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.Nd software network interface encapsulating NS packets in IP packets
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.Sh SYNOPSIS
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.Cd options NSIP
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.Fd #include <netns/ns_if.h>
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.Sh DESCRIPTION
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The
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.Nm nsip
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interface is a software mechanism which may be
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used to transmit Xerox
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.Tn NS Ns (tm)
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packets through otherwise uncooperative
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networks.
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It functions by prepending an
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.Tn IP
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header, and resubmitting the packet
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through the
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.Tn UNIX
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.Tn IP
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machinery.
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.Pp
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The super-user can advise the operating system of a willing partner
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by naming an
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.Tn IP
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address to be associated with an
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.Tn NS
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address.
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Presently, only specific hosts pairs are allowed, and for each host
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pair, an artificial point-to-point interface is constructed.
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At some future date,
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.Tn IP
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broadcast addresses or hosts may be paired
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with
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.Tn NS
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networks or hosts.
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.Pp
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Specifically, a socket option of
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.Dv SO_NSIP_ROUTE
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is set on a socket
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of family
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.Dv AF_NS ,
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type
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.Dv SOCK_DGRAM ,
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passing the following structure:
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.Bd -literal
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struct nsip_req {
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struct sockaddr rq_ns; /* must be ns format destination */
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struct sockaddr rq_ip; /* must be ip format gateway */
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short rq_flags;
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};
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.Ed
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.Sh DIAGNOSTICS
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.Bl -diag
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.It nsip%d: can't handle af%d.
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The interface was handed
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a message with addresses formatted in an unsuitable address
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family; the packet was dropped.
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.El
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr ns 4
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.Sh HISTORY
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The
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.Nm
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interface appeared in
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.Bx 4.3 .
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.Sh BUGS
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It is absurd to have a separate pseudo-device for each pt-to-pt
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link.
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There is no way to change the
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.Tn IP
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address for an
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.Tn NS
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host once the
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encapsulation interface is set up.
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The request should honor flags of
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.Dv RTF_GATEWAY
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to indicate
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remote networks, and the absence of
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.Dv RTF_UP
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should be a clue
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to remove that partner.
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This was intended to postpone the necessity of rewriting reverse
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.Tn ARP
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for the
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.Xr en 4
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device, and to allow passing
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.Tn XNS
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packets through an
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Arpanet-Milnet gateway, to facilitate testing between some co-operating
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universities.
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