Re: [LARTC] problem in routing

[Nuno Miguel Pais Fernandes <npf@eurotux.com>]

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On Tue, 2002-11-12 at 15:51, Martin A. Brown wrote:
> Hello Nuno,
> 
> I'd suggest s/POSTROUTING/PREROUTING/ here:
> 
>  : iptables -t mangle -A POSTROUTING -d SOME.IP.IN.INTERNET -j MARK
>  : --set-mark 21
>  : 


Ok..

i've done that without success.
Please watch that the routing is made in the router machine and the
marking is made in the linux box before and because of that it doesn't
matter where i mark the packets.


Thanks anyway
Nuno Fernandes


>  : In my ROUTER i want to redirect packets according to MARK and i'm doing:
>  : 
>  : root@euroter(~)# more /etc/iproute2/rt_tables 
>  : 255	local
>  : 254	main
>  : 253	default
>  : 200	over
> 
> Consult Stef Coene's kernel packet traveling diagram, which should 
> explain (visually) why you want to mark the packet before the routing 
> stage.
> 
>   http://www.docum.org/stef.coene/qos/kptd/
> 
>  : root@euroter(~)# ip route ls table over
>  : default via XXX.XXX.XXX.XXX dev eth1
>  : 
>  : where XXX.XXX.XXX.XXX is the gateway of the provider 1.
>  :
>  : Doing ip rule ls, i can see that all packets with mark 21 go to table
>  : over.
>  : root@euroter(~)# ip rule ls 
>  : 0:	from all lookup local 
>  : 32765:	from all fwmark       21 lookup over 
>  : 32766:	from all lookup main 
>  : 32767:	from all lookup default 
> 
> Naturally, the RPDB (displayed with "ip rule show") is consulted as part 
> of the routing process.
> 
> So, in short, your host euroter is doing as follows:
> 
>   - routing the packet
>   - marking the packet
>   - transmitting via provider2
> 
>  : And table over only has default gw, but when i do a
>  : ping XXX.XXX.XXX.XXX it goes throw proveider2 and not provider1.
> 
> Good luck,
> 
> -Martin
-- 
Nuno Miguel Pais Fernandes <npf@eurotux.com>
Eurotux S.A.

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