Re: Routing packets over multiple links (NICS) all on the same ISP all with same gateway.

Linux Advanced Routing and Traffic Control

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On 16-08-2006 16:18, Jacques Rompen wrote:


On 8/16/06, *Jarek Poplawski* <jarkao2@xxxxx <mailto:jarkao2@xxxxx>> 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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