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For about another week I'll be connected to 2 providers simultaneously from home.

I thought this could be a great time to double my bandwidth (I have ADSL + HSDPA) thanks to the fact that my computer has 2 cards, each connected to one of the routers.

I'm simply excited about the idea that I could use JDownloader to download twice faster.

The problem is that even if both connections are active, Windows always prefers 1 network card, specifically the HSDPA router that is currently connected over a Gigabit ethernet cable instead of the ADSL (5Mbit/s) connected over a regular 100Mbit Ethernet.

Do you know a way to tell Windows (or eMule and JDownloader separately) to open connections on both hardware network cards for any destination and balance traffic instead of preferring a single card only?

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OK I said "doubling" in my title. I know that HSDPA + ADSL != 2xHSDPA but I gave the idea ;-) –  djechelon Jun 10 '12 at 19:45
    
do you have a router? what is the brand/model? Routers decide the path, computers/switches/hubs do not. –  Logman Jun 10 '12 at 19:56
    
    
@Logman I have a TP-Link wireless router connected to ADSL and to card 2 of my Windows host, and a Huawei router provided by my second ISP with a backup USB dongle inserted in it (in case ADSL doesn't work). The TP-Link router has only 1 WAN interface, so there is no routing choice ;-) –  djechelon Jun 10 '12 at 20:02
    
Lookup changing metrics. I'm on my cell so I can't describe it enough to be an answer –  Canadian Luke Jun 10 '12 at 20:03
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2 Answers

up vote 2 down vote accepted

I can't try it out myself since I don't have a second internet connection at hand, but OCTOPUS+ seems to be exactly what you're looking for.

From their about page:

[...] OCTOPUS+ will help in utilizing all the active internet connections available in a computer. OCTOPUS+ will intelligently manage the traffic between a computer and the internet among the available active internet connections. [...]

This should automatically boost all multipart downloads.

A license costs USD 29.99, but you can download a free 30-day trial from CNET.

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Manual way for JDownloader, just for the sake of sharing (I won't accept this answer)

In general, when you are connected to 2 ISPs with 1 favourite by Windows: disconnect favourite provider, start downloads (you need a premium account to start multiple downloads), once they are started connect the other card and from JDownloader windows double the number of concurrent downloads/connection.

It helped me go from 315KBps to 800KBps+

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If there is no better answer over the next couple of days, there is nothing wrong with accepting your own answer. –  Xavierjazz Jun 10 '12 at 20:37
    
I don't like "manual ways of doing things" :-) –  djechelon Jun 10 '12 at 20:43
    
You can offer a bounty, but I'd wait. –  Xavierjazz Jun 10 '12 at 21:01
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