It's not a myth, I just renumbered my IP's, had 1 hour TTL on all records, and had 1/3 of my hosting customers complain that the site was unavailable for up to two days after the switch, and they rebooted, cleared cache, used ipconfig /flushdns if available, and at 5 different dns checking sites, including DNSStuff.com, all was great with all problem domains within a couple of hours. DNS propogation is definitely hindered by some. Most trouble customers were on roadrunner.
Thanks, Chuck Frolick ArgoLink.net -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of R. Scott Perry Sent: Monday, December 01, 2003 5:38 PM To: [EMAIL PROTECTED] Subject: Re: [IMail Forum] disable domain >I did not want to use DNS because of propagation time. In addition, if >the customer knows the IP address they can still get to the server. Just an FYI -- the idea of uncontrolled "DNS propagation" is mostly a myth. The amount of time between making a DNS change and having the DNS entries used by 100% of the Internet is under your control in most cases. Essentially, it's [1] the TTL value for the DNS record in question plus [2] the amount of time it takes your backup DNS servers to update when the information is changed on the primary DNS server. Rumor has it there are a few Internet providers out there that cache DNS records longer than they are supposed to (which violates the RFCs), but there aren't many from what I have heard (I've heard rumors, but never seen a case of it actually happening). Also note that while your customer may be able to retrieve (and send) their mail by using the IP address, people can't send them mail once the DNS is changed. -Scott --- Declude JunkMail: The advanced anti-spam solution for IMail mailservers. Declude Virus: Catches known viruses and is the leader in mailserver vulnerability detection. Find out what you've been missing: Ask about our free 30-day evaluation. --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
