[Click] Questions on IP_classifier and UdpGen

[betamaz]

Hi,

I have a few questions about testing udpgen.click and udpcount.click
(below is my configuration file).  I'm using the smaple configs
provided in conf/ directory.

First, why is the ip_classifier output set to '1' and not '0'? When
trying with '0' I would get the error below.  In general, where should
I look to know output parameters that should be set when using an
element? I'm not having much of a success looking in the .cc files.

udpcount.click:18: can't reuse 'ip_classifier :: IPClassifier' push output 0
udpcount.click:18: 'ip_classifier :: IPClassifier' output 1 unused
Router could not be initialized!


Second, after running, in /proc/click where should I look for the
count result of udpcount.click?
file /proc/click/ctr seems like the best possible candidate, but the
results I see are:
[/click/ctr]# more bytecount
0
[click/ctr]# count
0.  

Also, there are folders named 1 though 12.  In folder 'more
/proc/click/4/count' = 115. On the otherhand,  'more
/proc/click/6/count' = 0. These files are continuously being updated.

What do these numbered folders represent? And why do some increment
while others don't?


Thanks for your help,
Bita.

---------------------------------------------
// udpgen.click


elementclass UDPGen {
  $device, $rate, $limit, $size,
  $seth, $sip, $sport, $deth, $dip, $dport |

  source :: FastUDPSource($rate, $limit, $size, $seth, $sip, $sport,
                                                $deth, $dip, $dport);
  pd :: PollDevice($device) -> ToHost;
  source -> td :: ToDevice($device);
}

u :: UDPGen(eth0, 82000, 820000, 1500,
	    00:0C:41:1F:9D:85, 128.111.40.189, 1234,
	    00:0C:41:1F:9D:73, 129.111.40.200, 1234);


---------------------------------------------

// udpcount.click

AddressInfo(the_interface 129.111.40.200 00:0C:41:1F:9D:73);

classifier	:: Classifier(12/0800 /* IP packets */,
			      12/0806 20/0001 /* ARP requests */,
			      - /* everything else */);
ip_classifier	:: IPClassifier(dst udp port 1234 /* relevant UDP packets */,
				- /* everything else */);
in_device	:: PollDevice(the_interface);
out		:: Queue(200) -> ToDevice(the_interface);
to_host		:: ToHost;
ctr		:: Counter /* or AverageCounter */;


in_device -> classifier
	-> CheckIPHeader(14, CHECKSUM false) // don't check checksum for speed
	-> ip_classifier
	-> ctr
	-> Print(ok:udp)
	-> Discard;
classifier[1] -> ARPResponder(the_interface) -> out;
classifier[2] -> to_host;
ip_classifier[1] -> to_host;