projects / unix-history / blame
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| ef8cc9a4 KS |
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) %G% | |
| 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. |