the big question is how do i make trafick go from 192.168.0.1 or 192.168.100.1 to 0.0.0.0 etc. and what about our 6 different dns servers? we have 3 x 512/512 and 3 x 2 different dns servers.
If i understand correctly, what you want, is the one PC doing the routing, firewalling and traffic shaping. It has one interface (perhaps with multiple addresses) that everyone uses as their default gateway.
It then has one or more another interface/s that it directs load balanced traffic out across the links to the 3 ISPs.
You should be able to do this fairly easily with an equalized default route and source based routing (for the return traffic).
Then just plug in the firewall and QoS on the interfaces in between.
Was that the answer you wanted? or did you want some specific examples?
For the DNS problem, you may want to run something like dnsmasq (http://thekelleys.org.uk/dnsmasq/doc.html) on your router PC, and then add all the dns servers to your resolve.conf and add appropriate host routes on the correct gateways.
regards
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