Hello bind-announce,

BIND 9.11 is now in its last quarter of support. We are fixing critical 
security issues only at this point. It is time to start making plans to update 
if you are still running a 9.11 version. (The current release plan is published 
at https://kb.isc.org/docs/aa-00896 <https://kb.isc.org/docs/aa-00896>.)

BIND 9.11.0 was published in October of 2016. A *lot* has happened since then. 
Also, we have refactored some significant functions in BIND and 9.16 has quite 
a few changes compared to 9.11.

One of our support engineers analyzed the differences in options between the 
versions, and wrote this KB article for people migrating: 
<https://kb.isc.org/docs/changes-to-be-aware-of-when-moving-from-911-to-916> .

We also have updated the ‘BIND Significant Features Matrix’ with the major 
feature differences between releases. This is not as detailed as the KB 
mentioned above. https://kb.isc.org/docs/aa-01310 

While we don’t have current performance tests that compare the latest 9.11 
version to the latest 9.16 version, we did quite a bit of performance testing 
on the 9.16 branch in 2021 and we do not expect any loss of performance moving 
from 9.11 to 9.16. (see 
<https://www.isc.org/blogs/bind-resolver-performance-july-2021/> for 
performance results for resolver operations) There may be some changes in 
memory utilization, which we have tried to minimize in the latest versions. 
(see https://kb.isc.org/docs/bind-memory-consumption-explained 
<https://kb.isc.org/docs/bind-memory-consumption-explained> for more details).

For those using the ISC BIND packages:  

Because we are still patching 9.11, and we haven’t yet issued a new development 
branch, we are putting 9.18.0 into the bind-dev repositories, for now.

In April, we plan to do a version rollover:
- bind-esv will go from 9.11 to 9.16
- bind will go from 9.16 to 9.18
- bind-dev will go from 9.18.1 to 9.19.0 

BIND 9.19.0 will be the new development branch.


Vicky Risk
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