>
> I have 256 Kbps from one ISP and 128 kbps from other, also I have one firewall
> (ipf/nat) and three ethernet cards, how to do ipf/nat on one ISP I know, but how
> to set up, that if one link is almost used and to tranfer user to another ? Do
> I need to setup source routing ? And what the is it ? :) Also I have heard, that
> in some cases firewall van be configured that way: if from one ISP links is used
> up to 70%, to drop clients to another ISP, or maybe I dream about it last night
> ? :)

quite difficult.

my idea is to do script/program which will periodically ping both ISP's
and generate ipnat.conf depending on it.

there is no ready to use tool