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Annotation of 43BSDTahoe/man/man4/nsip.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1985 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)nsip.4      1.1 (Berkeley) 7/30/85
        !             6: .\"
        !             7: .TH NSIP 4 "July 30, 1985"
        !             8: .UC 6
        !             9: .SH NAME
        !            10: nsip \- software network interface encapsulating ns packets in ip packets.
        !            11: .SH SYNOPSIS
        !            12: .B options NSIP
        !            13: .br
        !            14: .B #include <netns/ns_if.h>
        !            15: .SH DESCRIPTION
        !            16: The
        !            17: .I nsip
        !            18: interface is a software mechanism which may be
        !            19: used to transmit Xerox NS(tm) packets through otherwise uncooperative
        !            20: networks.
        !            21: It functions by prepending an IP header, and resubmitting the packet
        !            22: through the unix IP machinery.
        !            23: .LP
        !            24: The super-user can advise the operating system of a willing partner
        !            25: by naming an IP address to be associated with an NS address.
        !            26: Presently, only specific hosts pairs are allowed, and for each host
        !            27: pair, an artificial point-to-point interface is constructed.
        !            28: At some future date, IP broadcast addresses or hosts may be paired
        !            29: with NS networks or hosts.
        !            30: .LP
        !            31: Specifically, a socket option of SO_NSIP_ROUTE is set on a socket
        !            32: of family AF_NS, type SOCK_DGRAM, passing the following structure:
        !            33: .nf
        !            34: 
        !            35: struct nsip_req {
        !            36:        struct sockaddr rq_ns;  /* must be ns format destination */
        !            37:        struct sockaddr rq_ip;  /* must be ip format gateway */
        !            38:        short rq_flags;
        !            39: };
        !            40: 
        !            41: .SH DIAGNOSTICS
        !            42: \fBnsip%d: can't handle af%d\fP.  The interface was handed
        !            43: a message with addresses formatted in an unsuitable address
        !            44: family; the packet was dropped.
        !            45: .SH SEE ALSO
        !            46: intro(4N), ns(4F)
        !            47: .SH BUGS
        !            48: It is absurd to have a separate pseudo-device for each pt-to-pt
        !            49: link.
        !            50: There is no way to change the IP address for an NS host once the
        !            51: the encapsulation interface is set up.
        !            52: The request should honor flags of RTF_GATEWAY to indicate
        !            53: remote networks, and the absence of RTF_UP should be a clue
        !            54: to remove that partner.
        !            55: This was intended to postpone the necessity of rewriting reverse ARP
        !            56: for the 
        !            57: .B en
        !            58: device, and to allow passing XNS packets through an
        !            59: Arpanet-Milnet gateway, to facilitate testing between some co-operating
        !            60: universities.

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