Hi Gert，
Thank you for your input.
Actually this behavior is a problem for us.since we have deployed GSLB across
our two separated data centers that have the same WWW service which provides
services simultaneously to our customers on the internet.still the same
scenario in the first email,one customer first time got the DNS response for
the server he/she wants to access is located in our primary data center.we want
the session established between the customer and the server to be kept and
serve the same customer for the data he/she might send later. In the same data
center we are able to keep the sessions between clients and servers.but this
session was broken due to some unknown issues,so the customer has to request
the same service again by sending DNS query.but this time the Local DNS server
B got this query and sent it out through IPv6 to the authority DNS.now the
problem raises,this IPv6 response may located in our Backup data center.since
we are not able to keep the session between two data centers the APP has to
send a new connection to the server that is located in our Backup data center.
This is the situation we do not want to face,however it really depends on how
the Local DNS Server work.
So any suggestions will over come it will be very appropriated.
BR
Jiazhan
--
----- Original Message -----
From: "Gert Doering" <g...@greenie.muc.de>
To: ???? <ying-xi...@163.com>
Cc: cisco-nsp@puck.nether.net
Sent: Sun, 6 Dec 2020 10:40:01 +0100
Subject: Re: [c-nsp] Local DNS cluster behavior
Hi,
On Sun, Dec 06, 2020 at 12:11:34PM +0800, ???? wrote:
> Based on the logic above we talked.Is it possible that the first time DNS
> query sent out by Local DNS Server A using IPv4 to the authority Server,but
> somehow the second time query by Server B turned out IPv6 query instead of
> IPv4?
Sure. Possible, and also fairly likely.
And no problem whatsoever.
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany g...@greenie.muc.de
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