Re: Routing decision?

[Wim Ceulemans <wim.ceulemans@able.be>]

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Ray

Do you mean that if I masquerade all my packets behind the firewall, 
that they are
considered as locally generated because due to the masquerading their 
source IP is changed?

This would mean that these packets would travel through the FORWARD 
chain and then through
the OUTPUT chain. And then the 'Kernel packet travelling diagram' would 
be completely wrong,
because packets come only in the OUTPUT chain if they originate from a 
local process.

Regards
Wim

Ray Leach wrote:

>On Mon, 2003-09-15 at 12:44, Wim Ceulemans wrote:
>  
>
>>Hi Ray
>>
>>In my opinion 'locally generated packets' can only be generated by a 
>>local process.
>>So in the diagram where it says 'local process', that's where the 
>>'locally generated packets' start
>>their way through the kernel. Where's the difference?
>>
>>    
>>
>What about packets that get SNATed?
>Where are they generated?
>
>  
>
>>Regards
>>Wim
>>
>>Ray Leach wrote:
>>
>>    
>>
>>>On Mon, 2003-09-15 at 10:49, Wim Ceulemans wrote:
>>> 
>>>
>>>      
>>>
>>>>Hi
>>>>
>>>>In paragraph 6.2 of the iptables-tutorial the following is said:
>>>>"The OUTPUT chain is used for altering locally generated packets (i.e., 
>>>>on the firewall) before they get to the routing decision.
>>>>
>>>>But in paragraph 3.1, the "Traversing of tables and chains" diagram, we 
>>>>see the "Routing decision" is listed after the "Local process" and
>>>>BEFORE! the packet goes to the output chain.
>>>>
>>>>So which one is right? Does the routing decision take place after or 
>>>>before the packet travels through the output chain?
>>>>   
>>>>
>>>>        
>>>>
>>>Are you not getting confused with 'locally generated' and 'local
>>>process'. They are not the same thing.
>>>
>>> 
>>>
>>>      
>>>
>>>>Regards
>>>>   
>>>>
>>>>        
>>>>


-- 
Wim Ceulemans
R&D Engineer

Secure Internet Communication with aXs Guard

Able NV
Leuvensesteenweg 282 - B-3190 Boortmeerbeek - Belgium
Phone: + 32 15 50.44.00 - Fax: + 32 15 50.44.09
E-mail: wim.ceulemans@able.be



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