Load Balancing over A Bidirectional and Uni-directional Link

Linux Advanced Routing and Traffic Control

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Hi All,

I want to achieve load balancing over two internet
links where  one link is both upload and download and
the other link is download only (satellite).

I am running a linux host as a router with one
internet link of 256 kbps which supports about 50 LAN
users. We are not running any servers and all the
traffic originates from the LAN. My first link (say
link A) gives me a bandwidth of 256 kbps (upload as
well as download) and is through an ethernet
interface. I am planning to add a satellite link (link
B) which will give me a download only bandwidth of 256
kbps. This link will be through a PCI - DVB (Digital
Video Broadcast) Card. I want to configure the system
in such a manner that all the upload is done through
link A while the download traffic gets equally divided
between the two links. I have seen the LARTC - HOWTO
which explains load balancing over multiple links. But
the problem in this case is that there is only one
outgoing physical link. How do I setup routing as well
as the SNAT in IPTABLES so that I am able to achieve
load balancing between the two links.

Thank  you,

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