[Click] Help, do the routes in click's route table must appear in the linux's route table ?

[wubaochuan]

Hi Roman,
Thank you for your help, I will try.
But I am using user-level click, I doubt that whether ToHost can work.
After I read ToHost's document, it says "ToHost 
<http://read.cs.ucla.edu/click/elements/tohost> requires an initialized 
FromHost <http://read.cs.ucla.edu/click/elements/fromhost> with the same 
DEVNAME",
But when I test FromHost.u and FromHost, error occurs as following:

root at wubaochuan-desktop:~# click -e "FromHost.u(eth0)->Discard;"
config:1: syntax error near '.'
config:1: unknown element class 'u'
root at wubaochuan-desktop:~# click -e "FromHost(eth0)->Discard;"
config:1: While initializing 'FromHost at 1 :: FromHost':
warning: Linux universal tun failed for eth0: Invalid argument
unspecified error
Router could not be initialized!



I want to know the reason of these errors, thank you.


Yours
Chuan



> Date: Wed, 02 Mar 2011 17:05:55 -0800
> From: Roman Chertov <rchertov at cs.ucsb.edu>
> Subject: Re: [Click] Help, do the routes in click's route table must
> 	appear in the linux's route table ?
> To: click at pdos.csail.mit.edu
> Message-ID: <4D6EE973.5050104 at cs.ucsb.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 03/02/2011 04:56 PM, wubaochuan wrote:
>   
>> Hi everyone,
>>       I installed Fedora12 and click1.8 on my machine, it can work as a
>> router. Now the router  can  forward  packets  sent by other machine,
>> but when I ping other machine, it tells me there is no route. The reason
>> is when I ping other machine, it has to look up route table on
>> Fedora12(can be showed by command `route -n`), not the route table in
>> click1.8, but when I add a default route for Fedora12, I can ping other
>> machine. I want to know, do the routes in click's route table must
>> appear in the linux's route table? if the routes in click's route table
>>     
>
> They will not appear, as Click forwarding tables are separate from the 
> kernel forwarding tables.
>
>   
>> do not appear in the linux's route table, the router can not work as a host.
>>     
>
> You will have to check that the packets are destined for the router, and 
> then use the ToHost element to send the packets to the linux IP stack.
>
> Roman
>
>   
>>      Thank you.
>>
>> Yours
>> Chuan
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>> click at amsterdam.lcs.mit.edu
>> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>>
>>