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
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