Shorewall users - Nov 2002 - xDSL and Cable Connection Failover

I''ve been doing some research and I haven''t found the complete
answer, so I
thought I''d post it to all of you.

Here''s what I want to do:
RH 7.3 System with 4 NIC''s
eth0 for PPPOE based DSL (netdsl)
eth1 for DHCP based Cable Internet (netcable)
eth2 for WWW, MAIL, FTP Servers (dmz probably DNAT)
eth3 for 10.0.1.0 network (loc)
I have Dynamic DNS for my domains.

First problem: Can anyone suggest a failover package to support this?
I''m
looking at failoverd but not sure if it''s what I need or should I hack
through gated, although I''m not very familiar with it? I need to run a
different Dynamic DNS script depending on the active/primary connection. If
I could do outbound (loc to netdsl and netcable) load balancing as well,
that would be great but not necessary.

I''ve been using Shorewall for a few months now, awesome gob guys! And I
think it should be able to handle the firewalling/NATing for both
connections using DNAT for www mail ftp to DMZ. Am I on the right track?

If you could point me down the appropriate paths, that would be great!

Thanks
Colin