Fail-over

[Norman Zhang]

Pete Tenereillo wrote:
>> You can have two A records in DNS, but if someone tries connecting to
>> the un-routable IP address it will fail. They will have to try again and
>> they could end up getting the same IP address again. They will have to
>> keep trying until they get the routable IP address.
> 
> isn't really  a correct answer. Virtually all Web clients, and most 
> proxy servers, would connect to the other IP address should one become 
> unreachable. The delay various between clients, but most are about 20s. 
> More at: www.tenereillo.com/GSLBPageOfShame.htm.
> 
> I don't see how DynDNS can help, and SRV records are a fantasy at this 
> point.

I've seen HW routers claiming this can be done (e.g., Radware Linkproof, 
ZyWALL35, Xincom). I'm discussing this at 
http://www.dslreports.com/forum/remark,12739889~mode=flat, folks their 
explained how DynDNS can work without BGP.

Regards,
Norman Zhang