Load Balancing w/ Proxies

[RonSenykoff@xxxxxxxx]

Hello all.

I have load balancing (DSL + Cable)
ala nano HOWTO + some modifications. Works great.

      LAN
       |
  -----------
  | LOAD    |
  |BALANCER |
  -----------
  |        
|
Firewall  Firewall
  |        
|
Cable      DSL
Modem      Modem
  |        
|
Internet Internet


I would like to be able to define proxies
for certain applications so that I can force
them to use a particular interface
and thus control if they go out cable vs DSL. You think
I could install some kind of proxy
on the load balancing box and achieve this or will I need
to make two proxy server boxes, one
off each external interface on the load balancer?

I'm using the load balancer for home
office use. I want to specify, say for streaming video to use
the cable modem, as it has a much higher
download rate. I know I could create some static routes
for certain ports (I have already done
this using mangle) but I don't want to have to do
this every time I configure a new application.
By having 'proxies' any application that supports
proxy server can be configured for
a particular interface. It could be quite convenient. It doesn't
need to be a true proxy like Squid,
just something to relay the traffic.

Any ideas are greatly appreciated,
-Ron