There are a number of very effect "appliance" style solutions to doing this.
Please have a look at RadWare (WSD) and F5 Networks (3DNS); I have had great
success with both companies. The bonus is that these solutions can
automaticly determine if a server is up.
Ken Seefried, CISSP
:yegon writes:
> we have several servers colocated with several ISP's
> i am trying to sort out some configuration that would ensure good uptime for
> customers
>
> i want to place the html documents of every customer on two separate servers
> connected to separate ISP's
> the dns servers will point to one server and the second one will be just a
> backup, in case the main server goes down we just change the DNS and point
> the affected domains to the backup server. when the main server is back up
> the dns changes back to normal
>
> and now my questions:
> 1. what should the times in zone files be set to to enable the dns change to
> be propagated very quickly, say 5 minutes max.
> is it possible/wise to use TTL=0
>
> 2. if a domain has 2 name servers set during registration, are both of these
> servers used for lookups? Or is it so that just the primary is querried if
> it works, and the secondary is querried only if the primary is not
> responding?
>
> 3. is this whole idea worth consideration anyway or should I forget it?
>
>
> thanks for answers
>
> Martin Dragun
>
>
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