automatically switching to alternate internet connection without any disruption

I have two different internet connections, is it possible to do a setup that if one connection drops automatically i get the internet from another connection??? if  i am downloading something i dont want it to be interrupted. If i cannot do this in ISA server is there any other solution???
shariqsaeedAsked:
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Keith AlabasterEnterprise ArchitectCommented:
ISA - as you likely know leaves support in 2012. It's replacement, Forefront Threat Management Gateway has this feature built-in - called ISP-R. Use the load-balancing option.

http://blogs.technet.com/b/isablog/archive/2009/10/14/the-isp-redundancy-feature-of-forefront-tmg.aspx
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jader31Commented:
I'm sorry to say, but as far I know, there're no way you can keep the download connection if you change the way you connect...you must to be able to start over, using a download manager or something else.

Watch this:

PC ------ MAGIC SOLUTION ----------- WEB1
                                           +-------------WEB2----------------source of download

the connection to download is done from PC to source, and you'll change the path IN THE MIDDLE OF DOWNLOAD ? No way... as far I can tell you.
The test option is MAGIC SOLUTION request a path change, and I'm not sure it will work for everything or anything.
As magic solution you could use a Cisco RV02 or a firewall with double WAN as pfSense... but even that way I'm not sure your download will resume ok.
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Dave BaldwinFixer of ProblemsCommented:
You won't be able to keep a download going when you change connections.  The entire path has to be re-established and if you are using two different ISPs, every server along the path is likely to be different.  Try doing a traceroute to some common server along the two paths and you will see that most of the servers listed are not the same.
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Keith AlabasterEnterprise ArchitectCommented:
We all have our own views. Not all sites that provide downloads will have session-state/sticky control, that's true but many of the bigger players do nowadays. As TMG also holds a session state of the outbound connections and will switch these to the second wan interface, it is likely the closest you will get - without a guarantee of course. No way of telling the capabilities on the remote sites in advance.
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shariqsaeedAuthor Commented:
Actually I have ISA Server. I want to use two different ISP, if any one will go down then other one should be active. Just i want to know is there any solution for this?

At user end user doesn't know  that i have one ISP or two ISP. (internet connection) he should not disconnect internet at his site.
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jader31Commented:
ok... so your request is internet failover.
I'm a linux guy and never used a ISA server.
I do this using pfSense or a appliance Cisco/Linksys RV042. Sorry. I cannot help you anymore that suggest you to use pfSense/RV042. Regards / Merry Christmas

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Keith AlabasterEnterprise ArchitectCommented:
Bottom line, ISA does not support two external interfaces. You would have to either use a dual-wan interfaced router, upgrade from ISA to TMG or move to a different solution altogether
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shariqsaeedAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for shariqsaeed's comment http:/Q_27508347.html#37335822

for the following reason:

There is no solotuion for my question.
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Keith AlabasterEnterprise ArchitectCommented:
There is a solution - it's just you may not like it.
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