RE: ICMP Protocol Unreachable

["Mani Mahadevan" <mrsmani@cisco.com>]

Seems to me that the packet contents are not filled properly and
sent out to B.
Best way is to
* Enable IP forwarding
* Ping from A to B.
* At B , run tcpdump get the packet contents.
* Now try running with your program. Compare the contents.
This should throw light on any issues related to pkt contents.

-Mani


-----Original Message-----
From: kernelnewbies-bounce@nl.linux.org
[mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of paridhi bansal
Sent: Tuesday, December 03, 2002 1:53 PM
To: kernelnewbies@nl.linux.org; sarnold@wirex.com
Subject: Re:ICMP Protocol Unreachable


Hi

U are not getting the problem.

When A sends echo request packet to B, B should send a
reply packet back to A. But this is not what's
happening. I have put a sniffer on B. B is receiving
the packet as such with source as A and destination B.
SO what u r saying that i am chaanging the ip b4
forwarding the packet is not happening.

The problem is :B is sending the ICMP packet with 
Source:B 
Destination :Gateway's Interface to B
The ICMP packet type is Destination unreachable
and it's code is Protocol Unreachable.


The same thing also happens the other way round i.e
when B pings to A. So i assume problem is somewhere in
the code..Can it be some port problem or what????

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