DNS Flag Day: I had to open the TCP/53 port

[Ron Hall]

Just about anything (if it is large enough).....


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On 2019-02-04 08:56 AM, Roberto Carna wrote:
Thanks Ben for your response, can you tell me the types of TCP traffic I have to expect in BIND, excepting Zone Tansfer?

Thans a lot again!!!

El lun., 4 feb. 2019 a las 10:50, Ben Croswell (<ben.croswell at gmail.com<mailto:ben.croswell at gmail.com>>) escribió:
BIND has always required UDP and TCP 53 for proper functionality. It sometimes mistakenly believed that TCP is only for zone transfers but that is not the case.

On Mon, Feb 4, 2019, 8:46 AM Roberto Carna <robertocarna36 at gmail.com<mailto:robertocarna36 at gmail.com> wrote:
Dear, I have a BIND 9.10 public server and I have delegated some public domains.

When I test these domains with the EDNS tool offered in the DNS Flag Day webpage, the test was wrong wit just UDP/53 port opened to Internet.

After that, when I opened also TCP/53 port, the test was succesful.

Please can you explain me the reason I have to open TCP/53 port to Internet from February 1st to the future???

Really thanks, regards.
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--

Ron Hall
Senior System Administrator, NCS - Core Infrastructure Applications
IT Services
T: +1 514 398 3718
ron.hall at mcgill.ca<mailto:ron.hall at mcgill.ca> | www.mcgill.ca/it<https://mcgill.ca/it>

[cid:part7.AFA911F1.FD188252 at mcgill.ca]
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