[Click] Packets Gets garbled !!!!

[Paine, Thomas Asa]

IM,
	I'm not 100% sure this is your problem, but if you don't first
use CheckIPHeader, CheckIPHeader2, or MarkIPHeader BEFORE using a
IPClassifier it will cause Segmentation faults.  I'm relatively knew to
this framework, but from my little experience, I'm guessing this has to
do with the headroom that is left in the packet buffer in the heap.  It
allows for elements to grow headers without needing to reallocate
memory.  This may be what is happening in your case.  By not first
defining/marking the header offset, you are getting garbage back or
running off the end of a buffer.  Hope this helps.  The IPClassifier
documentation is where I first seen reference to this, but it may also
be mentioned in your routing elements.


Thanks, 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
Thomas Paine (paineta at uwec.edu) 
University of Wisconsin - Eau Claire 
Computing & Networking Services 
garbage foo(garbage g){return(g);};  


-----Original Message-----
From: click-bounces at amsterdam.lcs.mit.edu
[mailto:click-bounces at amsterdam.lcs.mit.edu] On Behalf Of Indian Mogul
Sent: Saturday, October 02, 2004 8:07 PM
To: click at amsterdam.lcs.mit.edu
Subject: [Click] Packets Gets garbled !!!!

Hi, 
     I have a very simple case for implementing a routing table (RT) in
click and the output of the click is totally garbled. Here is my
scenario:

<Config File>
FromDevice(eth0) -> rt:: StaticIPLookup
(129.107.0.0/16 0, 129.107.10.0/24 1, 0/0 2)

rt[0]-> ToDump (f0.dump, ENCAP IP);
rt[1]-> ToDump (f1.dump, ENCAP IP);
rt[2]-> ToDump (f2.dump, ENCAP IP);

</Config File>

I have the following problems: 
 1. I am running click on a machine on
129.107.10.23/24
 I find that all the output is directed toward f2.dump even though I
have packets with dst addr 129.107.10.23 (me),

2. The output of f2.dump is totally screwed up. Upon opening with
ethereal I see src and dst addr as N/A.

3. If I triy using with IPClassfier (with the appropriate syntax), I get
a segmentation fault.

4. I am running click 1.4.2 on linux 2.4.21

Thanks,
IM 


		
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