2 ISP DSL bonding/sharing

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   I have one Linux system that masquerades for an internal network. It
also has mail, DNS and apache with mod_ssl servers, and a proprietary
internet application server on it, and acts as a firewall with ipchains
(it's still runing 2.2.x). It has two NICs, one connected to a low-end
10/100 switch and the other to a DSL modem.
   I've ordered another DSL connection from another ISP, because SBC had
some serious problems here in CA recently that resulted in two different
down times of over 12 hours. Its primary purpose is for backup when the SBC
DSL goes down. I can take care of rerouting under those connections (I
believe -- we'll see).
   I'd like to use them both when they're both up. I guess the simplest
possibility is to send all the internal network traffic through the new
connection, leaving the first for internet traffic. This is not, though,
the most efficient use (because the internal network traffic isn't all that
heavy most of the time).
   Is there a way to use both connections for both uses, with some kind of
bonding or sharing system? If so, is there a description that a non-wizard
can understand somewhere?
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