On Monday 02 December 2002 10:55, Andrei Boros wrote:> Suppose:
>
> ipchains -A forward -s inside_net -d 0/0 -j MASQ -m 100
>
> (similar setup with iptables:
> iptables -A PREROUTING -t nat -s inside_net -d 0/0 -j SNAT
> iptables -A PREROUTING -t nat -s inside_net -d 0/0 -j MARK --set_mark
> 100)
>
> eth0 = outside iface
> eth1 = inside iface
>
> now:
> tc filter add dev eth0 ... handle 100 fw
> should catch packets marked by the above rule in ipchains (iptables).
>
> Ok. When the packet returns, the masq/nat code will find it in
it''s
> table and demasquerade it (as if by an invisible inverse rule).
> Question:
> Will the demasqueraded packets also bear the mark 100?
No. The mask only exists =ion the firewall. If a packet leaves the firewall,
the information is gone.
> And will
> tc filter add dev eth1 handle 100 fw
> Work?
No.
> I am probably missing something, as I haven''t been able to make it
work
> this way.
> Any suggestions, please?
> I want to shape the incoming traffic that I route for my inside network
> on the inside iface with queues and more complex shaping, rather then
> just a plain drop on the outside iface.
You have to mark the packets if they come from the internet. So the mark is
still available if you want to shape the packets if they leave eth1.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
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