Re: [gentoo-server] Failover-capable DNS server?

[Jos Houtman <jos@hyves.nl>]

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Hi,

Why don't you create a short lived (say 5 minutes) A record for
target.example.com.
Under normal circumstances both ns1 and ns2 will return 11.22.33.44

You can then create a script that monitors the internet connection of isp A.
If that is down, it will update the A records for target.example.com to the
secondary IP adress.

Because your A record has a short timeout, downstream clients should pick
up the new ip address relatively quickly.
However you have to be aware that some ISP ignore such short lived A
records and cache the resolved address for a longer period of time.

Depending on your internet connection, I might consider offloading this
burden to a hosting company.

Jos

On Mon, Nov 21, 2011 at 10:52 AM, Pandu Poluan <pandu@poluan.info> wrote:

> Hello all, I'm in need of some suggestions.
>
> You see, I have 2 Internet connections with public IP addresses, let's
> say ISP A 11.22.33.44 and ISP B 22.33.44.66
>
> Now, I want outside parties trying to connect to "target.example.com"
> by default resolves to 11.22.33.44, but if ISP A's connection goes
> down for any reason, the DNS server will instead return "22.33.44.66".
>
> The nameserver itself will be located in the company, accessible from
> the world via "ns1.example.com" = 11.22.33.44:53 or "ns2.example.com"
> = 22.33.44.66:53. This allows the nameserver to monitor the state of
> the connections to ISP A and ISP B.
>
> I've been perusing pages discussing BIND, and came to the conclusion
> that BIND is incapable of doing that.
>
> Anyone can recommend me a DNS server that has such capability? Or how
> to implement this ability with maybe Python or (*shivers*) Perl?
>
> Rgds,
> --
> FdS Pandu E Poluan
> ~ IT Optimizer ~
>
>  • LOPSA Member #15248
>  • Blog : http://pepoluan.tumblr.com
>  • Linked-In : http://id.linkedin.com/in/pepoluan
>
>

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