bind 9.16 vs. 9.14 tcp client connections

[Ondřej Surý]

Hi Arsen,

we think you are hitting a problem that was reported to us earlier.  Since it
has been now circulated on the bind-users, we made the merge request public:

https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/3163

and patch:

https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/3163.patch

ISC will be issuing a proper Operational Notification later this week
and the fix will be included in BIND 9.16.1 due in March.

Sorry for the inconvenience.

Thanks,
Ondrej
--
Ondřej Surý
ondrej at isc.org

> On 5 Mar 2020, at 10:11, Arsen STASIC <arsen.stasic at univie.ac.at> wrote:
> 
> Hi,
> 
> Bind 9.16 was installed on 3/2 15:45 and tcp connections ramped up to maximum:
>   rndc status | grep -i tcp
>   tcp clients: 102/150
>   TCP high-water: 150
> 
> Switching back to bind 9.14 on 3/4 15:45 shows "normal" tcp client behavior:
>   rndc status | grep -i tcp
>   tcp clients: 29/150
>   TCP high-water: 67
> 
> I have found some tcp related changes in the later versions of 9.15 <https://ftp.isc.org/isc/bind/9.16.0/CHANGES>, but nothing which is explaining this kind of behaviour.
> (attachment is in logarithmic scale)
> Has someone else experienced this too?
> 
> cheers,
> Arsen
> <bind9.16-tcp-d1b.png>_______________________________________________
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