On Mon, Nov 21, 2011 at 16:52, Pandu Poluan <pa...@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?
>
To illustrate further, here's the pseudo-language logic that I want to
implement:
if ( request == target1.example.com )
{
if ( state("ISP A") == "up" )
{
return "target1.example.com = 11.22.33.44"
}
else
{
return "target1.example.com = 22.33.44.66"
}
}
if ( request == target2.example.com )
{
if ( state("ISP B") == "up" )
{
return "target2.example.com = 22.33.44.66"
}
else
{
return "target2.example.com = 11.22.33.44"
}
}
So, as you can see, there are actually two targets, one defaults to
ISP A (unless ISP A is down, then it 'falls back' to ISP B), and the
other defaults to ISP B (unless ISP B is down, then it 'falls back' to
ISP A).
Rgds,
--
FdS Pandu E Poluan
~ IT Optimizer ~
• LOPSA Member #15248
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