Round Robin A Records

[Mike Black]

Shouldn't it be possible now to use nsupdate?

Assuming primary/secondary DNS are NOT on the same machines as the www
servers (should work even if they are the same):

Each www server would try and ping the other www server (or better yet try
to connect to port 80) -- if no answer it sends an nsupdate to BOTH DNS
servers.  This would seem to me to cover most cases of the loss of any one
of the four machines.   Each www server would add itself on bootup and
remove itself on shutdown.

You could also do this from the DNS boxes themselves to actively check
availabilty of the www servers.

________________________________________
Michael D. Black   Principal Engineer
mblack at csihq.com  321-676-2923,x203
http://www.csihq.com  Computer Science Innovations
http://www.csihq.com/~mike  My home page
FAX 321-676-2355
----- Original Message -----
From: "Steve Ford" <sford at ncc.dhl.com>
To: <bind-users at isc.org>
Sent: Thursday, October 19, 2000 6:41 AM
Subject: Round Robin A Records


Can someone please advise:

We have two web servers mirrored. We have setup DNS (BIND 4.9.7) like
this to round robin the requests:

www    0300    IN A    198.141.222.111
            0300    IN A    198.141.223.117

When a client attempts to resolve the address of the hostname 'www' is
it true that the client will receive one of the IP addresses on a round
robin basis?

If we lose one of the servers, say it is booted down, every second
request will be the IP address of the unavailable server.

Does anyone know a way of configuring DNS so that if one server is down
all requests are directed to the available server dynamically? Manually
we remove the A record for the unavailable server.

Regards,
Steve


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