[CentOS] High Availability using 2 sites -- yep, "propogation."

[Mickael Maddison]

Hello Les,

Forgive me for this sidestep, but you are saying that Windows/IE
actually ignores bad IP addresses if a site lists multiple IP's in a
DNS lookup?  I tried this approach for some redundancy a couple years
ago and it didn't seem to work as you suggest.  If it has indeed
changed to work that way, this will help one of my clients immensely.

-- 
Best regards,
 Mickael
            mailto:centos at silverservers.com

Thursday, January 5, 2006, 10:51:57 AM, you wrote:

> On Thu, 2006-01-05 at 12:18, Bryan J. Smith wrote:

>> Exactomundo.  Even Google has to accomodate such.  That's why
>> their model is piecemeal and localizes as much as they can.
>> 
>> But even Google has an ASN, AS15169, when it comes to their
>> combined presence.

> I think they know better than to try to flap BGP routing
> around to accomodate a failed computer at one site or
> another, though.  Is that what you are suggesting? 

> BGP would normally be used to handle routing over multiple
> paths to a fixed location and would change in response to
> the route availability.  You can play tricks by shuffling
> a route to a completely new destination if a whole site fails
> but the minimum you could move would be a whole class
> C at a time, and some bad things will happen during the
> switch as different machines with the old IP's become visible.