Do many ISP's cache A records with TTL of 0 ?

[Mark van Kerkwyk]

Thanks Brad,
     thanks just want I wanted to hear. This came up in a discussion when
we were going over some GSLB issues and two people stated that *many* ISP's
practiced this, and one other person singled out AOL. I have certainly
never seen it before and I am sure Foundry,Alteon,Cisco etal would have
beat us to creating the page of shame if it was occuring.

Thanks

Mark




                                                                                                                    
                    Brad Knowles                                                                                    
                    <brad.knowles at s       To:     "Mark van Kerkwyk" <mark at vk.net>, bind-users at isc.org              
                    kynet.be>             cc:                                                                       
                    Sent by:              Subject:     Re: Do many ISP's cache A records with TTL of 0 ?            
                    bind-users-boun                                                                                 
                    ce at isc.org                                                                                      
                                                                                                                    
                                                                                                                    
                    01/09/2001                                                                                      
                    00:14                                                                                           
                                                                                                                    
                                                                                                                    





At 10:45 AM +0100 9/1/01, Mark van Kerkwyk wrote:

>  I was told that a while back AOL used to cache all records for a number
of
>  days, irrespective of whether it had a TTL of 0 or anything (eg over 1
>  day).

           I used to work at AOL, and indeed I was the primary person who
set up their system-wide caching nameserver farm (capable of handling
32,000-64,000 DNS queries per second), and I continue to maintain
contacts there within the DNS Admin group.  I've never heard of them
doing anything like this in my life.

>  Does anyone know of any ISP's perform this practice and in turn screw up
>  any global server load balancing which utilises a TTL of 0, if so, where
>  might one find a list of who does this ?

           I'm not aware of any ISPs that do this, and if I did, I would
make sure that they are published on a "page of shame".

--
Brad Knowles, <brad.knowles at skynet.be>

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