To my knowledge, there is no way to download one file from two different connections connected to two different ISPs at the same time. If you are running BGP then you might be able to load balance across the two links, but that would require your upstream providers to allow you to use it, and possibly the purchase of a public AS number an IP address space depending on the setup. If you are doing NAT past this link (IE both of your lines go two the same ISP and same address blocks, but they want to give you 2x 10mb links for 20mb total), then you can look at doing load balancing on layer 2 (Fast EtherChannel, bonding, Link Aggregate Groups, whatever), or creating 2 PPP style links between the computers and using a routing protocol like OSPF, EIGRP (but not on Linux) or something. I believe OSPF does equal cost load balancing, BGP and EIGRP can, I think, do unequal cost load balancing. But either way, I don't think that's the solution in your case.
The only other option I can think of would be some sort of software that sends every other packet to a different IP or something, which would need to run at the end you are downloading at or maybe at your ISPs, but I can't think of anything like that.
-Will
-----Original Message-----
From: Vladimir Burciaga Aguilar [mailto:anakinv7@xxxxxxxxxxx]
Sent: Monday, September 18, 2006 12:09 PM
To: lartc@xxxxxxxxxxxxxxx
Subject: RE: [LARTC] Problem with Load Balancing
>We have also set up a somewhat similar method of load balancing. Our
>traffic is never a 50-50 split (well 3:2 is how we have it set, but it
>doesn't always get close to that), but as the load picks up, it tends to be
>closer to the actual amount.
[snip]
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