Ahh Thanx again. -----Original Message----- From: Ben Scott [mailto:[email protected]] Sent: Friday, June 11, 2010 8:36 AM To: NT System Admin Issues Subject: Re: DNS settings tool
On Fri, Jun 11, 2010 at 7:48 AM, David W. McSpadden <[email protected]> wrote: > IndianaMembersInsurance.COM was messed up by the ISP making > Mail.IndianaMembersInsurance.com into > Mail.IndianaMembersInsurance.IndianaMembersInsurance.com. I think I mentioned recently that in names like <mail.IndianaMembersInsurance.COM.>, the trailing dot is significant. Now you know why. The trailing dot represents the root zone, and tells DNS software the name is fully qualified. Without a trailing dot, DNS software generally assumes it has to append the current zone origin on to a name. So when someone enters <mail.IndianaMembersInsurance.COM> into your zone file, the origin (your second-level domain) gets appended, yielding <mail.IndianaMembersInsurance.COM.IndianaMembersInsurance.COM.>. We humans can look at that and see it's stupid, but the computer doesn't know that. When working with DNS issues, it's a good idea to get in the habit of specifying FQDNs with the trailing dot all the time. -- Ben ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
