[Click] FromHost->ToDevice and ARPResponder

[dmoore7@nd.edu]

Yes, I did eventually get it working, but didn't want to keep spamming the
listserv.  However, seeing as folks may put time into answering my questions, I
will be sure to update in the future.
Thanks,
 - David

Quoting Eddie Kohler <kohler at cs.ucla.edu>:

> 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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> > click at amsterdam.lcs.mit.edu
> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>