Hi,
I have a question concerning the configuration of multiple uplinks as described in the lartc howto, chapter 4.2:
I have a scenario as described in the lartc in Chapter 4.2 (Routing for multiple uplinks/providers), i.e. one linux router with two uplinks:
* 2 Mbps low delay DSL connection on device eth0 * 256 kbps higher delay DSL connection on device ppp0
I'm routing packages according to the service:
* http, VoIP and ssh over eth0 (priority traffic) * everything else over ppp0 (non-priority traffic)
I do also require some non-priority traffic to use the route over eth0.
So I set up netfilter rules to mark the traffic accordingly:
* no mark for default/non-priority traffic to be routed over ppp0 * -j MARK 1 for priority traffic to be routed over eth0 * -j MARK 2 for traffic always over eth0
Then I set up the following additional routing tables:
* 201 for priority traffic: 'default via <gateway of isp1> dev eth0
* 202 for traffic static over eth0 'default via <gateway of isp1> dev eth0
I left the default routing table (254) unchanged except for the default route:
'default via <gateway of isp2> dev ppp0
As described in an earlier post in this list, the rp_filter has to be disabled and the traffic for eth0 has to be SNATed to the IP of the interface as the kernel uses the IP of the ppp0 interface as source IP of every package.
However, I do not require to set up any other fancy routing entries described in the lartc howto to make the whole thing to work. The question is, am I missing an important point here?
Furthermore, I don't get how the routing entries as described in the howto ensure that traffic is routed out over the same interface as it was originally comming in. I only see rules that match outgoing traffic, but none that matches incomming traffic. Maybe someone has a spare minute to enlighten me ;)
thanks in advance christoph
--
Christoph Georgi ----------------------------- email. christoph.georgi@xxxxxx fon. +64 (0)9 815 8259
registered linux user #380268 ubuntu 5.04 (ubuntu.com) _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
