nsip(4) - NetBSD Manual Pages

NSIP(4)                   NetBSD Programmer's Manual                   NSIP(4)


NAME
nsip - software network interface encapsulating NS packets in IP packets
SYNOPSIS
options NSIP #include <netns/ns_if.h>
DESCRIPTION
The nsip interface is a software mechanism which may be used to transmit Xerox NS(tm) packets through otherwise uncooperative networks. It func- tions by prepending an IP header, and resubmitting the packet through the UNIX IP machinery. The super-user can advise the operating system of a willing partner by naming an IP address to be associated with an NS address. Presently, on- ly specific hosts pairs are allowed, and for each host pair, an artifi- cial point-to-point interface is constructed. At some future date, IP broadcast addresses or hosts may be paired with NS networks or hosts. Specifically, a socket option of SO_NSIP_ROUTE is set on a socket of fam- ily AF_NS, type SOCK_DGRAM, passing the following structure: struct nsip_req { struct sockaddr rq_ns; /* must be ns format destination */ struct sockaddr rq_ip; /* must be ip format gateway */ short rq_flags; };
DIAGNOSTICS
nsip%d: can't handle af%d. The interface was handed a message with ad- dresses formatted in an unsuitable address family; the packet was dropped.
SEE ALSO
intro(4), ns(4)
HISTORY
The nsip interface appeared in 4.3BSD.
BUGS
It is absurd to have a separate pseudo-device for each pt-to-pt link. There is no way to change the IP address for an NS host once the encapsu- lation interface is set up. The request should honor flags of RTF_GATEWAY to indicate remote networks, and the absence of RTF_UP should be a clue to remove that partner. This was intended to postpone the ne- cessity of rewriting reverse ARP for the en(4) device, and to allow pass- ing XNS packets through an Arpanet-Milnet gateway, to facilitate testing between some co-operating universities. NetBSD 1.4 November 30, 1993 1

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