[LARTC] Re: Routing packets over multiple links (NICS) all on the

From: Jarek Poplawski <jarkao2@o2.pl>
To: lartc@vger.kernel.org
Subject: [LARTC] Re: Routing packets over multiple links (NICS) all on the
Date: Thu, 17 Aug 2006 06:54:11 +0000	[thread overview]
Message-ID: <ec13pb$ee8$1@sea.gmane.org> (raw)
In-Reply-To: <ebuoth$aeu$1@sea.gmane.org>

On 16-08-2006 16:18, Jacques Rompen wrote:
> 
> 
> On 8/16/06, *Jarek Poplawski* <jarkao2@o2.pl <mailto:jarkao2@o2.pl>> wrote:
> 
>     As far as I know multipath cached should work for routing output
>     of a current box but it's not working for router (if something
>     has not changed lately). Multipath without "cached" should do
>     simple randomization, but maybe for the begining it would be
>     better to assign fixed paths by source ip and save experimenting
>     with multipaths for later.
> 
>     Jarek P.
> 
>  
> Hi Jarek,
>  
> I will try with only multipath.
>  
> Ive tried the static routes. But still ive had trouble getting this code 
> to work
> ip ro add default  nexthop via x.x.x.x dev eth1 weight 1 nexthop via
> y.y.y.y dev eth2
> ip route add default table provider1 via x.x.x.x dev eth1
> ip route add default table provider2 via y.y.y.y dev eth2
> because x.x.x.x = y.y.y.y in my case. Somehow it doesnt look at the eth 
> device anymore.

Anyway in my opinion it should work.
Try something like this:

#IP_ROUTE_MULTIPATH = "y"
#(if 2.6.x  IP_ROUTE_MULTIPATH_CACHED = "n" !)
#Here with CONNMARK method (so without Anastasov's patch!).
#Change 192.168.0.0/24 and eth0 to your local network
#address/mask and interface.

ip route add default nexthop via x.x.x.x dev eth1 \
   nexthop via x.x.x.x dev eth2

ip route add 192.168.0.0/24 dev eth0 table 101
ip route add default via x.x.x.x dev eth1 table 101

ip route add 192.168.0.0/24 dev eth0 table 102
ip route add default via x.x.x.x dev eth2 table 102

ip rule add fwmark 1 table 101
ip rule add fwmark 2 table 102

iptables -t mangle -A POSTROUTING -o eth1 -j MARK --set-mark 1
iptables -t mangle -A POSTROUTING -o eth2 -j MARK --set-mark 2

iptables -t mangle -A POSTROUTING -j CONNMARK --save-mark
iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark

echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter

You should also add NAT (MASQERADE) rules.

Nexthop devices will be changed randomly per flow (with some 
caching) so try with destinations from different networks.

Jarek P.

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