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Full Discussion: Source IP address field in RREP on DSR routing
Special Forums IP Networking Source IP address field in RREP on DSR routing Post 302919829 by acu281 on Saturday 4th of October 2014 02:22:23 PM
Old 10-04-2014
Source IP address field in RREP on DSR routing
Hello
I have a question about routing in MANET using Dynamic Source Routing protocol.
IN RFC4728 (DSR) in section "IP fields" of RREP (Route Reply) packet we have this:
Quote:
Source Address
Set to the address of the node sending the Route Reply. In the
case of a node sending a reply from its Route Cache (Section
3.3.2) or sending a gratuitous Route Reply (Section 3.4.3),
this address can differ from the address that was the target of
the Route Discovery.
ok.
I read in several books and also in rfc4728 that: when a source node (node that initiate route discovery process) receive a RREP it are not able to understad which node sent that RREP!!
But why?

rfc say that the value of source IP address field of RREP packet is IP address of node that send RREP. and this packet forwarded toward Source node.
My question is why??! why source node can not always understand that which node is sender of RREP?

Please guide me
tnx
 

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LEARN ABOUT FREEBSD

ng_ether_echo

NG_ETHER_ECHO(4)					   BSD Kernel Interfaces Manual 					  NG_ETHER_ECHO(4)

NAME

     ng_ether_echo -- netgraph ether_echo node type

SYNOPSIS

     #include <netgraph/ng_ether_echo.h>

DESCRIPTION

     The ether_echo node type reflects all data and control messages back to the sender.  It assumes (and does not check) that the packet is an
     ethernet frame, and swaps the source and destination addresses before echoing it.	This node type is used for testing and debugging.

HOOKS

     A ether_echo node accepts any request to connect, regardless of the hook name, as long as the name is unique.

CONTROL MESSAGES

     This node type supports only the generic control messages.  Any other control messages are reflected back to the sender.

SHUTDOWN

     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or when all hooks have been disconnected.

SEE ALSO

     netgraph(4), ng_echo(4), ng_ether(4), ng_hole(4), ngctl(8)

HISTORY

     The ng_ether_echo node type was implemented in FreeBSD 8.0.

AUTHORS

     Julian Elischer <julian@FreeBSD.org>

BSD
								 December 24, 2008							       BSD
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