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Selecting interface based on source and destination ip address

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Special Forums IP Networking Selecting interface based on source and destination ip address
# 1  
Old 07-30-2009
Bug Selecting interface based on source and destination ip address
Hi all,

I have some doubts in selecting the interface to transfer packets and receive the packets.

--> Multiple interfaces :
--------------------

1) 0.0.0.0 --------> wild card address.
2) x.x.x.x --------> valid address.(192.168.1.156)
3) ff.ff.ff.ff --------> broad cast address.


1) If an socket is binded to 0.0.0.0 and its destination ip address is ff.ff.ff.ff

In order to transfer a packet, the packet should be transferred through all interfaces.(broadcasetd).

2) If an socket is binded to 0.0.0.0 and its destination ip address is x.x.x.x

Based on destination ip address an inetrface will be selected to transfer the packet.

Before receiving the packets, the selected interface is closed.
Now the received packets consists of destination ip address as closed interfaces ip address. Whether the received packets are valid or not.


Thanks in advance.........
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LEARN ABOUT BSD

imp

IMP(4P) 																   IMP(4P)

NAME

       imp - IMP raw socket interface

SYNOPSIS

       #include <sys/socket.h>
       #include <netinet/in.h>
       #include <netimp/if_imp.h>

       s = socket(AF_IMPLINK, SOCK_RAW, proto);

DESCRIPTION

       The  raw  imp  socket  provides	direct access to the imp(4) network interface.	Users send packets through the interface using the send(2)
       calls, and receive packets with the recv(2), calls.  All outgoing packets must have an 1822 96-bit leader on the front.	Likewise,  packets
       received  by  the  user will have this leader on the front.  The 1822 leader and the legal values for the various fields are defined in the
       include file <netimp/if_imp.h>.	The raw imp interface automatically installs the length and destination address in the 1822 leader of  all
       outgoing packets; these need not be filled in by the user.

       If the protocol selected, proto, is zero, the socket will receive all IMP messages except RFNM and incompletes which are not input data for
       a kernel protocol.  If proto is non-zero, only messages for the specified link type will be received.

DIAGNOSTICS

       An operation on a socket may fail with one of the following errors:

       [EISCONN]      when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destina-
		      tion address specified and the socket is already connected;

       [ENOTCONN]     when trying to send a datagram, but no destination address is specified, and the socket hasn't been connected;

       [ENOBUFS]      when the system runs out of memory for an internal data structure;

       [ENOBUFS]      eight messages to the destination host are outstanding, and another eight are already queued for output;

       [EADDRNOTAVAIL]
		      when an attempt is made to create a socket with a network address for which no network interface exists.

SEE ALSO

       intro(4N), inet(4F), imp(4)

4.2 Berkeley Distribution					   May 16, 1986 							   IMP(4P)