[Click] FromHost->ToDevice and ARPResponder

[Eddie Kohler]

Hi David,

Well, I guess the config you mention:


RealToDevice :: Queue -> ToDevice(eth0);

RealFromHost:: FromHost(real0, 192.168.0.3/25);
RealToHost :: ToHost(eth0);
RealHostSplitter :: Classifier(12/0806 20/0001,	// ARP request
			   12/0806 20/0002,	// ARP response
			   12/0800,        	// IP packets
			   -);			// Any others

// Routing Setup
RealFromHost -> RealHostSplitter;
RealHostSplitter[0] -> Print(Real_Out_ARP_RQ) -> RealToDevice;
RealHostSplitter[1] -> Print(Real_Out_ARP_RP) -> RealToDevice;
RealHostSplitter[2] -> Print(Real_Out_IP) -> RealToDevice;
RealHostSplitter[3] -> Print(Real_Out_Other) -> RealToDevice;


might in fact work, as long as the address you gave to FromHost (namely 
192.168.0.3) actually exists on the eth0 local network -- that is, as long as 
the local network (eth0) will respond to ARP requests for 192.168.0.3, 
eventually responding to the current host.

Does it work?

Eddie


dmoore7 at nd.edu wrote:
> Hello,
> I've been working on manipulating outbound traffic, and am confused by the use
> and examples of a FromHost -> [stuff] ->ToDevice system.
> My understanding from documentation is that I ought to filter all outgoing
> traffic:
> FromHost -> Filter;
> Filter for ARP Requests -> ARPResponder -> ToHost;
> Filter for IP Traffic -> ToDevice
> 
> Won't sending all ARP requests to an ARP Responder, and connecting back ToHost
> prevent any ARP Requests intended for other machines from getting out?
> 
> What is the simplest configuration to intercept all outgoing packets, pass them
> though a Print element, and then send them on their way?  I have worked with
> using FromHost to capture the traffic, but I do not understand why I can't
> simply pass it on to ToDevice.
> 
> In short, what prevents a simple configuration like this from functioning?
> http://www.nd.edu/~dmoore7/clickconfig1.click
> 
> Thanks for your time and input,
>  - David Moore
> 
> 
> 
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