Miguel, Interesting. I haven't contemplated any aspect of your idea other than nameserver restarts. With 30,000 domains hosted here, our nameserver (which, according to the INTERNIC, is authorative for more domains than any nameserver in the world) takes about 20 minutes to restart (it's an SGI Challenge S). Our secondaries take a little longer. That's with one A record per domain. Restarting a nameserver every time a link gets sick is not an option, at least for us. Steve At 07:02 PM 6/5/97 +0800, Miguel A.L. Paraz wrote:
Hi,
Phil Howard wrote:
In effect Sprint is encouraging the waste of IP space. I'm putting together a proposal now for a web farm type of facility for a group of investors and a block of /19 is way more than is needed. But the plan is going to have at least 4 points of multi-homing to diverse backbone providers, so a fully announceable block is essential.
Idea: How about getting provider-dependent space from each one, then make the web servers listen on different addresses each. Rig the DNS with a low TTL for the server A records, or perhaps use dynamic updates (haven't tried it yet though) to remove the IP from the A list if a link goes down.
Example you get space from: ISP A 10.0.0.0/24 ISP B 10.1.0.0/24 ISP C 10.2.0.0/24 ISP D 10.3.0.0/24
So you have:
www.customer1.com IN A 10.0.0.1 IN A 10.1.0.1 IN A 10.2.0.1 IN A 10.3.0.1
www.customer2.com IN A 10.0.0.2 IN A 10.1.0.2 IN A 10.2.0.2 IN A 10.3.0.2
Now if ISP C goes down, delete 10.2.0.1 and 10.2.0.2 from the list.
-- miguel a.l. paraz <map@iphil.net> +63-2-893-0850 iphil communications, makati city, philippines <http://www.iphil.net>