[Click] (no subject)

[Harald Schioeberg]

On Wed, 2010-08-25 at 11:13 +0530, iaaaguru at tce.edu wrote: 
> prev post was on ip checksum element. it returns bad lengths. the
> following is the configuration. elements after checksum elemnt are not
> functioning. wats the error? help me
> 

There is no Element that sets the correct IP Header annotation, hence IP
specific Elements will not work. See CheckIPHeader. 

The tutorial at
http://read.cs.ucla.edu/click/tutorial1
and it's solutions give nice canonical examples of how to handle IP
packets.

Harald


> 
> //classifying the IP packet based on starting hex 45 00
> cl :: Classifier(14/45 , -);
> //capturing packets from eth1
> 	FromDevice(eth1)
> 	->[0]cl;
> 	cl[0]->
> //print org packets
> 	 Print(orig)
> //stripping ether header
> 	-> Strip(14)
> //printing altered packet
>         ->Print(strp)
> //altering contents
>         ->StoreData(4,A)
> //printf stripped packet
> 	->Print(stor)
> //seting chksum
> 	 ->SetIPChecksum()
> //ustriping packet
> 	 ->Unstrip(14)
> 	 ->Print(ustp)
> 	 -> Discard;
> cl[1]-> Discard();
> 
> 
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