[Seaside] Amazon EC2

Avi Bryant avi.bryant at gmail.com
Fri Sep 8 16:42:09 UTC 2006

On Sep 7, 2006, at 11:06 AM, Jason Johnson wrote:
> Right, but what I am saying is, the users (e.g. AOL users) are  
> using some ISP for internet access.  When they try to hit your  
> page, their PC sends a DNS request to whoever it's configured for,  
> which will be the ISP (e.g. AOL) servers.  The ISP servers will ask  
> the root servers, find you and give the answer, but they (or they  
> used to) ignore the TTL field.  They just run a modified version of  
> BIND or whatever with the cache time hard coded to 2 days.  So for  
> the next 2 days all users that use the effected ISP server will hit  
> that cache.  That wouldn't mean all of AOL for example, but some  
> percentage.
> Now I don't know how systems that us Dynamic DNS are getting around  
> this, but I guess they are so it probably wont be a problem.  All I  
> know is I changed over my domain some months back and I couldn't  
> get to my site for 2 days by name because of it.
> If this reminder is irrelevant for whatever reason, I apologize.  I  
> was trained for nearly a decade to point such things out. :)

No, thanks for explaining, I understand now.  That seems like  
obnoxious behavior on the part of AOL, but it would definitely pose a  
problem for the strategy I proposed.  Does anyone have any more data  
on whether this still happens and how DynDNS etc get around it (if  
they do)?


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