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BSD 2.11 - man page for nsip (bsd section 4)

NSIP(4) 				       Kernel Interfaces Manual 				      NSIP(4)

nsip - software network interface encapsulating ns packets in ip packets.
#include <netns/ns_if.h> Not currently supported under 2.11BSD
The nsip interface is a software mechanism which may be used to transmit Xerox NS(tm) packets through other- wise uncooperative networks. It functions 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, only specific hosts pairs are allowed, and for each host pair, an artificial 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 family 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; };
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.
intro(4N), ns(4F)
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 the encapsulation 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 necessity of rewriting reverse ARP for the en device, and to allow passing XNS packets through an Arpanet-Milnet gateway, to facilitate testing between some co-operating universities. 3rd Berkeley Distribution January 27, 1996 NSIP(4)

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