NSIP
Section: Devices and Network Interfaces (4)
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BSD mandoc
BSD 4.3
NAME
nsip
- software network interface encapsulating ns packets in ip packets.
SYNOPSIS
options NSIP
Fd #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 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;
};
DIAGNOSTICS
- 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.
SEE ALSO
intro(4),
ns(4)
HISTORY
The
interface appeared in
BSD 4.3
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
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(4)
device, and to allow passing
XNS
packets through an
Arpanet-Milnet gateway, to facilitate testing between some co-operating
universities.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- DIAGNOSTICS
-
- SEE ALSO
-
- HISTORY
-
- BUGS
-
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Time: 06:48:48 GMT, May 19, 2025