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I mean if one uses a VPN, can the ISP still see or know what exact URLs one visits or downloads from? By that I mean any URLs we type in our browser or even use URL Links in like jDownloader downloading data over HTTP.

For I think the Connection that the user makes to VPN goes through ISP only like this -

VPN Schematic

As we know VPN tunnels are encrypted, but how well encrypted are they really?

I read this and I didn't quite exactly understand, What he meant to say by corporate network and split tunnel. And what if one just uses net from home. What exactly did he mean to explain?

Yes the ISP can see your surfing traffic and DNS queries if your VPN is set up as split tunnel (where only traffic going to your corporate network goes over the encrypted VPN tunnel and every thing else goes out the regular internet path)

I also came to read this thing about URLs/IP Blocking -

To block content, all an ISP has to do is check the URL (website address) against a blacklist of banned sites, to decide whether the user should be accessing it. This same technology can be used to track people watching banned content as well. A method used to track the viewing of accessing a blacklisted website would trigger an alert.

So I wanted to know, while if accessing blocked/blacklisted URLs through a VPN, can it trigger an alert at the ISP end? I mean will they be able to see/know, what URLs one has Visited?

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If your ISP could listen in to your VPN traffic they would have called it Virtual Public Network :) –  Jack Jun 19 '13 at 10:25
    
The answer to your question depends on if the connection to the VPN is secure. Just disregard somebody with 11 reputation who offered no additional details, and posted a single response. As for if a VPN connection is encrypted or not encrypted I have not seen any VPN service offered where it does not use encryption. –  Ramhound Jun 19 '13 at 11:40
    
@Ramhound Citing anyone's reputation as part of your argument devalues it. You can call it what it is, not helpful, but even that argument is moot because it's a comment and not an answer. –  Jack Jun 19 '13 at 22:53
    
@Jack - The quoted text was posted as an answer, without any supporting documentation, I disregard answers like that almost all the time. We really going not agree the quoted text is just wrong? –  Ramhound Jun 20 '13 at 11:32
    
I agree the answer is crap, I thought you were referring to my comment :) –  Jack Jun 20 '13 at 12:13
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1 Answer

if it's correctly set up, all your traffic will get through the VPN and your ISP won't be able to see anything.

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so then does that means all data transmitted between VPN and ISP are also encrypted , that means "including" what typed URLs requests we make . so then does that means also in a way that - URLs also get encrypted ? so that ISP doesnt gets able to see URLs ? –  Steve Jun 19 '13 at 7:48
    
yes, VPNs (AFAIK) are encrypted (with server and client keys), and all data (not only page content, but url, dns request, etc) go through the VPN... –  pataluc Jun 19 '13 at 8:00
    
thanx @pataluc that was what i was bit concerned/bothered about; not just only data content like file or page content , but the data requests - url n dns thing. :) . thanx again ! –  Steve Jun 19 '13 at 8:24
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