You're correct that it's several layers up with the failover. SMTP servers know how to do this - web browsers don't. You'd get about a 50% fail ratio if one of your two web servers was down in the listed config.
Thanks, Brian Desmond [email protected] w - 312.625.1438 | c - 312.731.3132 From: John Gwinner [mailto:[email protected]] Sent: Thursday, November 17, 2011 7:18 PM To: NT System Admin Issues Subject: Redundant DNS On our SMTP hosting provider, they have 'redundant' DNS entries for the same FQDN: [C:\]nslookup server1.inboundmx.com Server: abc.xyz.local Address: 192.168.253.254 Non-authoritative answer: Name: server1.inboundmx.com Addresses: 216.82.253.99 216.82.255.3 216.82.242.99 216.82.242.115 216.82.250.115 My question to the group - can this general idea be used to create 'backup' web servers? i.e.: www.mycorp.com<http://www.mycorp.com> 1.2.3.4 www.mycorp.com<http://www.mycorp.com> 4.5.6.7 The way inboundMX described it, it was more of a load balancing thing. I don't think a client stack will know to query DNS 'again' if the first IP address was down. Is this kosher? I couldn't see a way on the big registrars to have multiple "A" records anyway, so it may not be possible, but I thought I'd check. == John == John Gwinner | Director of Technology DAZSI /Oracle Business Applications 310.640.1300 (office) | 310.640.9900 (fax) 880 Apollo Street - Ste. 201 | El Segundo CA 90245 [Description: cid:[email protected]]<http://www.dazsi.com/> ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected]<mailto:[email protected]> with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
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