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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 ULTRIX

ip

ip(4p)																	    ip(4p)

Name
       ip - Internet Protocol

Syntax
       #include <sys/socket.h>
       #include <netinet/in.h>

       s = socket(AF_INET, SOCK_RAW, 0);

Description
       The  IP	is the transport layer protocol used by the Internet protocol family.  It can be accessed through a ``raw socket'' when developing
       new protocols or special purpose applications.  IP sockets are connectionless and are normally used with the and calls.	The call, however,
       can also be used to fix the destination for future packets, in which case the or and or system calls can be used.

       Outgoing  packets automatically have an IP header prepended to them, based on the destination address and the protocol number the socket is
       created with.  Incoming packets are received with their IP headers and options intact.

Diagnostics
       On failure, a socket operation returns any of the following errors:

       [EISCONN]      Tried to establish a connection on a socket that already had one, or tried to send a datagram with the  destination  address
		      specified when the socket was already connected.

       [ENOTCONN]     Tried to send a datagram, but no destination address was specified and the socket was not connected.

       [ENOBUFS]      The system ran out of memory for an internal data structure.

       [EADDRNOTAVAIL]
		      Made an attempt to create a socket with a network address for which no network interface existed.

See Also
       send(2), recv(2), inet(4f), intro(4n), packetfilter(4)

																	    ip(4p)