SRV Record Server Availability

Andrew P. andrewemt at
Wed Jan 6 16:42:47 UTC 2021

Isn't this sort of dynamic functionality (real-time presence or absence of SRV records) what mDNS and the avahi daemon are for?

From: bind-users <bind-users-bounces at> on behalf of Matus UHLAR - fantomas <uhlar at>
Sent: Wednesday, January 6, 2021 8:51 AM
To: bind-users at
Subject: Re: SRV Record Server Availability

On 06.01.21 21:41, Wilfred Sarmiento via bind-users wrote:
>Your understanding is correct, i just thought that SRV can detect whose
>server is alive so it can choose and provide an answer with the available

DNS is not designed to provide this functionality. While technically you can
change contents of DNS depending on which servers are alive and which are
not, it's almost never a good idea.

That means, BIND has nothing like this built in.

>> On Tue, Jan 5, 2021 at 4:30 AM Wilfred Sarmiento via bind-users
>> <bind-users at> wrote:
>> > Is DNS Bind SRV record can detect the Server's availability? If yes, how?

>On Tue, 5 Jan 2021, 23:53 tale <d.lawrence at> wrote:
>> Could you provide more information about your goal?  I don't fully
>> understand the question.
>> For my reading, the answer is basically no, in that an SRV record just
>> provides data about where.a particular service can be found.  It's up
>> to other systems to fetch that data and interpret it, including
>> whether that service is actually available at the given endpoint.  In
>> its typical operation, BIND will just take whatever name and port the
>> zone administrator said to provide for that SRV record, and not do any
>> sort of availability checks on it.
>> However, if you go deep into a far more complicated, custom use of
>> BIND, you could set up a process that monitors the availability and
>> changes the SRV record accordingly.

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