06-21-2018
Quote:
Originally Posted by
anil1000
How to keep it alive? What do you mean by this, which connection to keep it alive? Kindly suggest..
In regular intervals packets are sent in an existing connection to make sure the partner still is there. These packets are called "keepalive" packets. If these packets are not received the partner assumes that the other side went dead and closes the connection.
Think of a connection like a telephone call: when you talk to someone you expect some sort of acknowledgement that the other is still listening at times, be it "aha" or "hmm" or something such. If you don't get that you may ask "are you still there" - and if there is no answer you hang up. This is quite the same mechanism.
I hope that helps.
bakunin
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NSIP(4) Kernel Interfaces Manual NSIP(4)
NAME
nsip - software network interface encapsulating ns packets in ip packets.
SYNOPSIS
#include <netns/ns_if.h>
Not currently supported under 2.11BSD
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(4N), ns(4F)
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 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)