[Click] Quick Question

[betamaz]

Hi,

In the sample configuration files udpcount.click/udpgen.click, why
does udpcount use an ARPResponder? Does it serve any purpose for
gathering udp statistics?

Thanks,
Bita.


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here is the config for reference:

AddressInfo(the_interface 1.0.0.1 0:0:c0:8a:67:ef);

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;