Search Again: Re: Quickdns-Talk Digest #1578 - 23/09/03 From: Men & Mice Support Date: Wednesday, September 24, 2003 Time: 11:16:48 am At 1:51 AM -0700 9/24/03, Len Conrad wrote: >>a1) >>How does one setup Quick DNS Name Server/s so that if >>a webserver is down they direct to a backup address. > >some "controller" has to detect or be told that a server is down, >and the controller dynamically update the zone of the server's A >record to a new IP address. This is using dynamic DNS for failover. >The A records will have to have a short TTL so when the A record is >changed, the effect of DNS caching will me minimized. This doesn't have to be done using dynamic DNS. It can also be done using an appliance (hardware). There are DNS-based appliances and there are HTTP inbound proxy appliances. >>a2) >>Alternatively choose the one of several web servers that responds first. > >some agent in the web servers senses server load reports the load >factor to the controller, that dynamically updates the A record in >DNS to the server that is least loaded. this is using dynamic DNS >zone for load balancing. > >>b) And how is this accomplished with mail servers. > >exactly the same way. Well, actually, for inbound SMTP, you can use MX records to achieve load balancing, fault tolerance, and fail-over service. ____________________________________________________________________ Chris Buxton Men & Mice Customer Support Specialist Making DNS Easy

Messages In This Thread: Re: Quickdns-Talk Digest #1578 - 23/09/03 by Kaj Hjorth on Sep 23, 2003 at 10:24:47 pm Re: Quickdns-Talk Digest #1578 - 23/09/03 by Len Conrad on Sep 24, 2003 at 1:53:25 am Re: Quickdns-Talk Digest #1578 - 23/09/03 by Men & Mice Support on Sep 24, 2003 at 11:16:48 am