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>