any way to detect condition "connected to ISP but not internet"?

Luis luis at anachreon.co.uk
Tue Jan 20 06:17:11 EST 2009


Hiya,

This initially looks like a dynamic IP issue. When it happens, can  
you ping (from the Terminal) www.google.com? This might also point to  
DNS problems.

What have the cable company said about it?

Cheers,

Luis.


On 20 Jan 2009, at 03:11, Josh Mellicker wrote:

> I just thought I'd ask the many networking gurus here:
>
> It seems easy with Revolution to check if connected to the  
> internet, if not connected, after a timeOutInterval, an error is  
> returned and it can be dealt with, no problem.
>
> However...
>
> Here at our office, we got Time Warner cable internet a few months  
> ago, and while it is speedy (20 mbits d/l!) every few weeks we  
> encounter a strange and perhaps rare situation where:
>
> 1. we are connected to our ISP
>
> 2. but our ISP is not connected to the internet
>
>
> On OS X, network diagnostics show:
>
> Ethernet = green
> Network Settings = green
> ISP = green
> Internet = red
> Server = red
>
> When we encounter this "false connection" condition, a browser,  
> rather than saying "cannot get web page because we're offline" will  
> hang forever.
>
>
> The danger here that we should all be aware of, is that if you sell  
> an app that, for example, checks for updates upon launch, if your  
> customer has this weird connectivity situation, your app will  
> freeze and the customer is unable to get past this and use the app  
> they legitimately paid you for.
>
> Even if the connectivity problem is rare, this is a situation we  
> want to avoid at any cost, so we have no automatic connection  
> routines. If they initiate a network operation, and the app hangs,  
> they can force quit and launch again, and not do that anymore now  
> that they know better :-)
>
>
> So, I wondered if any of you had any experience, workarounds or  
> ideas for detecting this "false connection" condition.
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