[LARTC] Routing using 2 ISPs (one flatrate - the other not)

[Torge Szczepanek <tsml@szczepanek.de>]

Hi!

I don't know if this was discussed here already.

I have the following setup:


ISP1 2 MBit flat ----------- eth0 \
                                     -- Linux Box eth2 --- private LAN
ISP2 100 MBit non-flat ----- eth1 /


The Linux box is running 2.4.x with iptables and DNAT for the local network.

Now I want to do the following bandwith allocation:

All data should be transferred from/to the 2MBit ISP, where I don't have 
to pay anything for my used bandwith (flatrate).

When the bandwith is filled up, I like to route all excess traffic 
through the ISP2 where I have to pay for all *incoming* traffic.

What is the best setup for this?

---

And now a little more complicated:

ISP1 2 MBit flat ----------- eth0 \                     / private LAN
                                     -- Linux Box eth2 --
ISP2 100 MBit non-flat ----- eth1 /                     \ ISP2 net

ISP2 net is a network, which is routed from ISP2 to my linux box.

Is there any possibility to route some of this traffic through the 2MBit 
link? I only have to pay for traffic which I receive *from* the internet.

-- 
Torge Szczepanek


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