[Click] generating random destination IP packets?

[Azeem Khan]

Hello everyone,

Oh good. Now I have two methods to do almost the same thing. Thanks a lot Eddie and Breyer. I will try using this second method also.

Actually right now CPU performance does not seem to be a bottleneck, the I/O bus seems to be the one. I just cannot saturate my gigabit link. I have NAPI enabled in the Linux 2.6.16.13 kernel but Click is not able to do device polling (only FromDevice). I am using 32-bit Intel PCI 82540EM cards. I will be looking into that next.

I have a couple of questions though,

1. The RandIPAddress / AnonymizeIPAddress elements: Can they generate invalid addresses like network addresses or broadcast addresses or anything else which might get dropped by the router?

2. I want to use the routing table for stress testing that you have posted in the comparison review of all the different routing lookup implementations; the one with 167K entries. But, when I use it, I get an out of memory error. Do I need to recompile Click with some options /changes? (I have 2GB RAM on the system under test).


Thank You.

Azeem Khan.
Bombay, India.



________________________________
> Date: Fri, 20 Apr 2007 09:46:14 +0200
> From: bcronje at gmail.com
> To: kohler at cs.ucla.edu
> Subject: Re: [Click] generating random destination IP packets?
> CC: azeem_k at hotmail.com; click at pdos.csail.mit.edu
>
> Oops, sorry Azeem. I didn't know about StoreIPAddress :)
> On 4/19/07, Eddie Kohler > wrote:
> Hi Azeem,
> You are missing one additional step: StoreIPAddress.
> FastUDPSource -> SetRandIPAddress -> StoreIPAddress(16) ->
> SetUDPChecksum -> SetIPChecksum should do it.
> If you are really trying to max out your outgoing bandwidth, you might
> want to alter FastUDPSource to set random destination IP addresses
> yourself, to avoid the additional checksums. But don't optimize
> prematurely, of course: wait and see if you have a problem.
> Eddie
> Azeem Khan wrote:
> > Hello everyone,
> >
> > I wish to generate UDP/IP packets with random destination IP addresses at different rates. From reading the Click element documentation, I believe that FastUDPSource + SetRandIPAddress + SetUDPChecksum + SetIPChecksum should do the trick. Am I correct?
> >
> > Will SetRandIPAddress also set the IP destination address randomly besides the annotation?
> >
> > If so, can anyone give me an example on how to use the SetRandIPAddress element? I cannot seem to get it right. I am not clear on what the arguments mean.
> >
> >
> > Thank You.
> >
> > Azeem Khan
> > Bombay, India.
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