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From: "Martin A. Brown" <mabrown-lartc@securepipe.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] problem in routing
Date: Tue, 12 Nov 2002 15:51:25 +0000	[thread overview]
Message-ID: <marc-lartc-103711636225883@msgid-missing> (raw)
In-Reply-To: <marc-lartc-103711402622386@msgid-missing>

Hello Nuno,

I'd suggest s/POSTROUTING/PREROUTING/ here:

 : iptables -t mangle -A POSTROUTING -d SOME.IP.IN.INTERNET -j MARK
 : --set-mark 21
 : 
 : 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

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com


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  reply	other threads:[~2002-11-12 15:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-12 15:13 [LARTC] problem in routing Nuno Miguel Pais Fernandes
2002-11-12 15:51 ` Martin A. Brown [this message]
2002-11-12 16:13 ` Nuno Miguel Pais Fernandes
2002-11-12 16:19 ` Martin A. Brown
2002-11-12 17:53 ` Nuno Miguel Pais Fernandes

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