Solved

Single domain, multiple IPs

Posted on 2009-03-30
2
3,379 Views
Last Modified: 2012-05-06
Hi,

Is there any way to configure multiple IP addresses within DNS for a single domain record? I have a client with an SBS server and this can be reached on two different IP addresses (primary and backup ADSL services). The normal way to do this would be with multiple MX records, but this is not possible here because mail is initially going through external spam fllter servers hence the MX records point there instead. Unfortunately the spam filter service has no automatic failover capability so I'm looking for a way to do this within DNS.

Is there way to configure host records such that a single URL (e.g. mailer.company.com) can resolve to multiple IPs? More importantly, can this be done in a way such that one address is primary and the other is only used if the primary is not reachable?

Tks.
0
Comment
Question by:regisit
2 Comments
 
LVL 70

Accepted Solution

by:
Chris Dent earned 500 total points
ID: 24019308

Outside of the MX record, no.

While you can have multiple Host records for a single resource the DNS server won't care if one of those resources is down, it will continue handing out the IP address. Responses for resources with multiple records are rotated using Round Robin to provide a simple form of load balancing.

You may consider utilising an internet based service to modify the Host record should one system fail. It's still pretty basic, but at least it can be instructed to check the status of the service.

As an example, see:

http://www.netriplex.com/solutions/critical_dns/pricing_and_packages.aspx

Many more available if you google for "DNS Fail Over".

Chris
0
 

Author Closing Comment

by:regisit
ID: 31564257
Thanks Chris, I'd just about come to the same conclusion. Preference would be to check Exchange so needs a way to check SMTP is up rather than the website. Seems EasyDNS has this capability.
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
F5 SSL Sticky Load Balancing Question 3 55
SPF record issue 6 53
DNS entry for intranet 1 19
Active Directory/sub domain vs root domain 3 31
There have been a lot of times when we have seen the need to enter a large number of DNS entries in a forward lookup zone. The standard procedure would be to launch the DNS Manager console, create the Zone and start adding new hosts using the New…
I've written instructions for one router type, but this principle may be useful for others of the same brand and even other brands of router. Problem: I had an issue especially with mobile devices that refused to use DNS information supplied via…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

832 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question