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

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NSIP(4) 										  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 otherwise 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

       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  neces-
       sity  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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