Bind9 weighted load balancing

Kevin Darcy kevin.darcy at
Fri Apr 30 20:00:24 UTC 2021

[ Classification Level: GENERAL BUSINESS ]

Duplicate RRs are suppressed, as per the standards.

RFC 2181, Section 5:

Each DNS Resource Record (RR) has a label, class, type, and data.  It
   is meaningless for two records to ever have label, class, type and
   data all equal - servers should suppress such duplicates if

That being said, a DNS-based load-balancer can probably do what you're
looking for.

                                            - Kevin

On Fri, Apr 30, 2021 at 3:44 PM Alperen Yılmaz <alperen0098 at>

> Hello everyone,
> There is a round robin resolving mechanism in bind9 where the server
> chooses different records to resolve for each request, but is there a way
> to assign weights so that the server resolves with different probabilities?
> All I could find about the topic was this old mail from the archive:
> It says you can put duplicate records for increasing the weight, however
> it also says that bind9 does not seem to support this.
> host    IN A
>         IN A
>         IN A
>         IN A
> Thank you,
> Alperen Yılmaz
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