[LARTC] How to balance OUTBOUND traffic by packet if..

[junk@maild.mine.nu]

how to use iproute/iptables to balance by packet OUTBOUND traffic between
2 PPP (pptp cable modem and pppoe adsl modem) links to the same ISP . also
by using the fact that the ISP dosen't filter  source IP address - meaning
i can use either PPP's link assigned IP address as the source IP in the ip
header.., it works for both devices.., what i want to achive is  : when
uploading a large file , i could use both devices to shoot data but bound
only to one source IP.

Naturally i could expect all data to go back through the device with that
corresponding IP , atleast that is what happens according to ethereal