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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 DEBIAN

rds-ping

RDS-PING(1)						    BSD General Commands Manual 					       RDS-PING(1)

NAME

     rds-ping -- test reachability of remote node over RDS

SYNOPSIS

     rds-ping [-c count] [-i interval] [-I local_addr] remote_addr

DESCRIPTION

     rds-ping is used to test whether a remote node is reachable over RDS.  Its interface is designed to operate pretty much the standard ping(8)
     utility, even though the way it works is pretty different.

     rds-ping opens several RDS sockets and sends packets to port 0 on the indicated host. This is a special port number to which no socket is
     bound; instead, the kernel processes incoming packets and responds to them.

OPTIONS

     The following options are available for use on the command line:

     -c count
	     Causes rds-ping to exit after sending (and receiving) the specified number of packets.

     -I address
	     By default, rds-ping will pick the local source address for the RDS socket based on routing information for the destination address
	     (i.e. if packets to the given destination would be routed through interface ib0, then it will use the IP address of ib0 as source
	     address).	Using the -I option, you can override this choice.

     -i timeout
	     By default, rds-ping will wait for one second between sending packets. Use this option to specified a different interval. The timeout
	     value is given in seconds, and can be a floating point number. Optionally, append msec or usec to specify a timeout in milliseconds
	     or microseconds, respectively.
     Specifying a timeout considerably smaller than the packet round-trip time will produce unexpected results.

AUTHORS

     rds-ping was written by Olaf Kirch <olaf.kirch@oracle.com>.

SEE ALSO

     rds(7), rds-info(1), rds-stress(1).

BSD
								   Apr 22, 2008 							       BSD