130 lines
3.9 KiB
Groff
130 lines
3.9 KiB
Groff
.\" Copyright (c) 1985, 1991 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.
|
|
.\"
|
|
.\" from: @(#)nsip.4 1.4 (Berkeley) 3/28/91
|
|
.\" $Id: nsip.4,v 1.2 1993/08/01 07:55:54 mycroft Exp $
|
|
.\"
|
|
.Dd March 28, 1991
|
|
.Dt NSIP 4
|
|
.Os BSD 4.3
|
|
.Sh NAME
|
|
.Nm nsip
|
|
.Nd software network interface encapsulating ns packets in ip packets.
|
|
.Sh SYNOPSIS
|
|
.Cd options NSIP
|
|
.Fd #include <netns/ns_if.h>
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm nsip
|
|
interface is a software mechanism which may be
|
|
used to transmit Xerox
|
|
.Tn NS Ns (tm)
|
|
packets through otherwise uncooperative
|
|
networks.
|
|
It functions by prepending an
|
|
.Tn IP
|
|
header, and resubmitting the packet
|
|
through the
|
|
.Tn UNIX
|
|
.Tn IP
|
|
machinery.
|
|
.Pp
|
|
The super-user can advise the operating system of a willing partner
|
|
by naming an
|
|
.Tn IP
|
|
address to be associated with an
|
|
.Tn NS
|
|
address.
|
|
Presently, only specific hosts pairs are allowed, and for each host
|
|
pair, an artificial point-to-point interface is constructed.
|
|
At some future date,
|
|
.Tn IP
|
|
broadcast addresses or hosts may be paired
|
|
with
|
|
.Tn NS
|
|
networks or hosts.
|
|
.Pp
|
|
Specifically, a socket option of
|
|
.Dv SO_NSIP_ROUTE
|
|
is set on a socket
|
|
of family
|
|
.Dv AF_NS ,
|
|
type
|
|
.Dv SOCK_DGRAM ,
|
|
passing the following structure:
|
|
.Bd -literal
|
|
struct nsip_req {
|
|
struct sockaddr rq_ns; /* must be ns format destination */
|
|
struct sockaddr rq_ip; /* must be ip format gateway */
|
|
short rq_flags;
|
|
};
|
|
.Ed
|
|
.Sh DIAGNOSTICS
|
|
.Bl -diag
|
|
.It nsip%d: can't handle af%d.
|
|
The interface was handed
|
|
a message with addresses formatted in an unsuitable address
|
|
family; the packet was dropped.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr intro 4 ,
|
|
.Xr ns 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
interface appeared in
|
|
.Bx 4.3 .
|
|
.Sh BUGS
|
|
It is absurd to have a separate pseudo-device for each pt-to-pt
|
|
link.
|
|
There is no way to change the
|
|
.Tn IP
|
|
address for an
|
|
.Tn NS
|
|
host once the
|
|
the encapsulation interface is set up.
|
|
The request should honor flags of
|
|
.Dv RTF_GATEWAY
|
|
to indicate
|
|
remote networks, and the absence of
|
|
.Dv RTF_UP
|
|
should be a clue
|
|
to remove that partner.
|
|
This was intended to postpone the necessity of rewriting reverse
|
|
.Tn ARP
|
|
for the
|
|
.Xr en 4
|
|
device, and to allow passing
|
|
.Tn XNS
|
|
packets through an
|
|
Arpanet-Milnet gateway, to facilitate testing between some co-operating
|
|
universities.
|