Search Again: Re: Best way to share multiple links to the net? From: Robert Woodhead Date: Thursday, March 13, 2003 Time: 1:32:19 pm At 8:00 PM +0000 3/13/03, QuickDNS Talk wrote: >Let me try to clarify the issues involved. > >You're asking about web service, not so much about DNS service, >right? You want to use DNS to solve the problem for web service, as I >see it. Yep. >Solution: Yes, set your web/mail/other-non-DNS servers to have one IP >on each subnet. Put one DNS server on each subnet. (You could use >more than one for each subnet, but that might be overkill.) > >Make each DNS server a master server for your zones. Don't edit them >together with QuickDNS 3.x or above - edit data on each server >separately. On each server, for the web service, list only the same >web server IP address as that DNS server is on. For DNS and mail >services, list both. So, more concretely: > >You have link A and link B. You have a web server with IP address A >and IP address B. You have two DNS servers, DNS A and DNS B. On DNS >A, the record for web service points to IP address A. On DNS B, the >record for web service points to IP address B. If link A goes down, >the DNS servers of the world will only find DNS B, thus only finding >IP address B for web service. > >Have I answered the question clearly? I hope so. This is an easy >solution once you grok it. Yes, I understand what you're saying, and it is cute. But questions: 1) Wouldn't it require a short refresh time? Consider the case of someone who happens to have accessed DNS and gotten the IP that comes in over link A. Then link A goes down. Until the DNS info expires, how are they going to find out about B? 2) This means that all the DNS servers have to be inside my area (behind links A and B), right? 3) Are DNS lookups smart enough that, assuming there are 2 master servers listed, they will pick one at random. Otherwise everyone is going to come down pipe A until it goes down and the DNS info expires. If this IS the case, then a partial solution might be to shuffle the order of the DNS servers listed for each domain I control (so a.com lists the pipe A dns server first, b,com lists the pipe B dns server first, etc). More details on exactly how to tweak this kind of config would be much appreciated. best R -- =========================================================== Robert Woodhead, CEO, AnimEigo http://www.animeigo.com/ =========================================================== http://selfpromotion.com/ The Net's only URL registration SHARESERVICE. A power tool for power webmasters.

Messages In This Thread: Best way to share multiple links to the net? by Robert Woodhead on Mar 12, 2003 at 4:46:17 pm Re: Best way to share multiple links to the net? by Ryan Salazar on Mar 12, 2003 at 4:52:06 pm Re: Best way to share multiple links to the net? by Len Conrad on Mar 12, 2003 at 5:07:23 pm Re: Best way to share multiple links to the net? by Men & Mice Support on Mar 13, 2003 at 12:58:41 am Re: Best way to share multiple links to the net? by Robert Woodhead on Mar 13, 2003 at 1:32:19 pm Re: Best way to share multiple links to the net? by Men & Mice Support on Mar 13, 2003 at 8:39:43 pm