[f-nsp] GSLB vs IE DNS Cache

[Lazuardi Nasution]

Hi Scott,

I think reordering the DNS record on GSLB only help for distributing
the first clients access. But, if one VIP which is previously accessed
by clients is failed, GSLB cannot help since the IE still cache the
failed VIP address and do not do DNS query until 30 minutes. In other
words, GSLB is useless if the browser still use their own DNS cache.
Any other opinion ?

Best regads,

> From: "Scott T. Cameron" <routehero at gmail.com>
> To: foundry-nsp at puck.nether.net
> Date: Tue, 15 Jun 2010 10:28:25 -0400
> Subject: Re: [f-nsp] GSLB vs IE DNS Cache
> DNS caching is a problem you'll face in more than just IE, but most applications that ever look up a DNS record will cache the record for some period of time -- if not indefinitely.
> There is no easy solution to that problem, except informing your customers to shut down the application and restart it.
> Your design for your customer facing applications will really determine the best way to use GSLB, and you may not ever need to run in to DNS caching problems -- design permitting.
> Scott
> On Tue, Jun 15, 2010 at 10:05 AM, Lazuardi Nasution <mrxlazuardin at gmail.com> wrote:
>>
>> Hi,
>>
>> In my understanding, the GSLB works by doing some ordering of DNS
>> records. The problem is the IE browser is doing DNS cache about 30
>> minutes regardless to the TTL and always use first DNS record without
>> trying to use next DNS records. How can we encounter this problem
>> without touching the client PCs ?
>>
>> Best regards,