Multiple DSL lines, load sharing / shaping

[Josh Finlay]

Hi,

My scenario:

Originally started out with 512Kbps SDSL, this wasn't enough bandwidth. We have no access to anything faster than this (except 1.5Mbps ADSL, but then our upstream drops to 256kbps - not acceptable), so we have had 4 additional lines installed...

So what I now need to know, is how do I go about sharing these connections evenly to the rest of the network?

the SDSL lines live on:
de0, de1, de2, de3, de4, de5
each interface is connected to an ADSL modem, with an established connection to the provider

de6 is the interface to provide connectivity to the rest of the network.

Can I use a "round-robin" NAT or something similar?

I am extremely lost as how to properly share these connections...

Regards,

Josh Finlay