Change DNS records automatically when a link is DOWN

[Matus UHLAR - fantomas]

On 05.06.19 12:15, Roberto Carna wrote:
>- Main site with an Internet link and two BIND services (DNS1 y DNS2) and a
>/28 block, and web and mail services supported
>- Backup site with a second Internet link and a BIND service (DNS3) and
>another /28 block
>
>When the Internet link from main site is DOWN, the web and mail traffic
>come through the backup site to main site crossing a L2L. So I need to
>change the IP's of the FQDN hosts I have supported in the DNS3 in order to
>continue offering services (web and mail). How can I do this automatically?
>Is there any way that "something" monitors the main Internet link and in
>case it is DOWN automatically order to modify the FQDN records in DNS3 ???

can't your provider set you up a routing failover?

While it's doable in DNS, it has some drawbacks (requires short TTL) and
mainly: DNS is not designed to do this kind of stuff.

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