F5 GTM/DNS - EDNS RFC COMPLIANCE

F5 DNS - EDNS RFC Compliance

¿Que es el DNS Flag Day?

El día en el que veremos internet arder (el apocalipsis)….

El 01 de febrero de 2019 cuatro de los principales proveedores de DNS Resolver, realizarán un lanzamiento de su software con una característica en común; la cual, es que se manejará el estándar EDNS de forma estricta. Esto presenta el fin de parches temporales históricos que perdonaban ciertas conductas desviadas del estándar en los servidores DNS autoritativos.

Dentro de los problemas que se tienen se encuentran:

DNS autoritativos que bloquean respuestas.
Malas implementaciones de DNS que no siguen los estándares.
Protecciones de seguridad (Firewalls, IDS/IPS, etc) mal implementados o con malas practicas que bloquean el trafico que sigue el estándar.
Los Resolver deben esperar timeout y reintentar con TCP y sin EDNS.

Por estos días algunos DNS públicos (Google, Facebook, PowerDNS, CloudFlare, Quad9, Cisco, etc) también realizaran estos cambios.

¿Qué es EDNS RFC 6891?

Define un mecanismo compatible con DNS para indicar soporte para nuevas opciones incluyendo soporte para paquetes más grandes (sobre 512 bytes), más códigos de respuesta, etc.

¿Para qué sirve EDNS?

Es requerido para para que funcionen las siguientes extensiones:

NSID -- RFC 5001: identificación de instancia del servidor
DNSSEC -- bit DO: por favor, responda con registros DNSSEC
Client-subnet, RFC 7871: desde qué red viene esta consulta?
Keep-alive, RFC 7828: timeout variable para DNS sobre TCP.
Cookies, RFC 7873: mecanismo liviano de seguridad.
Las nuevas extensiones y funcionalidades que en el futuro se puedan adicionar...

¿Qué impacto tiene este cambio sobre el modulo GTM/DNS de F5?

Dado que el servicio de GTM/DNS de F5 es un servicio de DNS y una de sus implementaciones es responder de forma autoritativa, éste debe seguir el estándar DNS y cumplir de forma estricta los RFC’s que definen el servicio.

Por esto se hace necesario realizar una validación de los servicios que pasan por F5 GTM/DNS con el fin de prevenir una posible afectación del servicio.

This entry was posted by jduque in category F5 and tagged dns, dns flag day, gtm, edns, f5, ngeek on Miércoles, 16 Enero 2019 23:40 in blog Ngeek Blog

Rating 0 0.

Bookmark

23204 responses found

Lanora on Viernes, 07 Julio 2023 14:23 said:

"Soldiers would hunt us," he recalled. Under Canadian regulation, First Nations men and women can hunt wolves without the need of limitations, but some others should get licenses for the hunting and trapping
seasons.

0 0

Octavio on Viernes, 07 Julio 2023 14:20 said:

The Bible tells us a large amount about what godly marriages really should appear like, with mutual submission and putting each individual other’s demands in advance of our own.

0 0

Lionel on Viernes, 07 Julio 2023 12:59 said:

0 0

Doyle on Viernes, 07 Julio 2023 11:43 said:

Greate post. Keep writing such kind of information on your page.
Im really impressed by it.
Hi there, You've done an excellent job. I will certainly digg it and individually suggest to my friends.
I'm sure they will be benefited from this website.

0 0

Alejandro on Viernes, 07 Julio 2023 11:09 said:

It's not my first time to pay a visit this web site, i am visiting this web site
dailly and take fastidious information from here every day.

0 0

Ramonita on Viernes, 07 Julio 2023 10:45 said:

Assuming there is truth to the notion that what we engage in defines us, the soaring level of popularity
of game titles considered violent by some demonstrates that
the United States has a violent lifestyle, but we know this.

0 0

Beverly on Viernes, 07 Julio 2023 09:52 said:

GADD people today even have their very own language - largely absolutely free of vowels, punctuation, money letters, and so on - which more mature
individuals criticise, but this is particularly how daily life and culture alterations.

0 0

ArminPekKN on Viernes, 07 Julio 2023 09:38 said:

Buying and selling Twitter accounts can be a lucrative investment [url=https://t.me/selltwitteraccounts]Softreg Twitter Professional [/url] Through a trusted marketplace, you can find age-old soft-reg accounts with a proven track record and established followers Buy Twitter accs Audience These accounts come with built-in audiences, allowing you to instantly reach a large number of potential customers Age Twitter accounts Increase

0 0

Terry on Viernes, 07 Julio 2023 08:45 said:

1984: Platini shines for flamboyant France. Neuman, Clayton (May 31,
2009). "Creator Vince Gilligan Answers Fan Questions".
Reeve, John L. (2009). "British Naval Strategy: War on a Global Scale".

Wahlgren, Eric (14 November 2009).

0 0

Luciana on Viernes, 07 Julio 2023 08:04 said:

Harmony Video Bio - Video of a woman contacting herself "Debbie"
in an on line dating video clip who finishes up obtaining
really psychological above her passion for cats.

0 0

Lynette on Viernes, 07 Julio 2023 07:39 said:

Heya are using Wordpress for your site platform? I'm new to the blog world but I'm trying to get started and create my own. Do you require any coding
knowledge to make your own blog? Anyy help would be greatly appreciated!

0 0

Ernestina on Viernes, 07 Julio 2023 06:32 said:

Feinberg is accused by Needles of betraying the firefighters under
him, as it seems Feinberg has made a corrupt bargain that may give him command over one other present home,
nearby Engine Company 333/Ladder Company 74, in trade for permitting his.

0 0

Vicki on Viernes, 07 Julio 2023 05:28 said:

Titles of couple preferred journals from this time period,
about 1896 to 1955, are Wink: A Whirl of Girls, Flirt:
A Fresh Magazine, and Snappy.

0 0

Nathan on Viernes, 07 Julio 2023 04:59 said:

You really make it srem so easy with yoour presentation buut I find
this matter tto be really something that I think I would never
understand. It seems too complicated and very broad for me.
I am looking forward for your next post, I'll
try to get the hang of it!

0 0

Sean on Viernes, 07 Julio 2023 03:38 said:

What's Happening i am new to this, I stumbled upon this
I've found It absolutely useful and it has helped me out
loads. I hope to contribute & assist other customers like its helped me.
Great job.

0 0

Sol on Viernes, 07 Julio 2023 03:24 said:

I really like it when individuals get together and share
views. Great website, continue the good work!

0 0

Kandace on Viernes, 07 Julio 2023 03:07 said:

During the submit-Naked Mile social gathering, Dwight spots Vicky, the girlfriend of the
leader of the midget fraternity, Rock. Later, as the movie closes, Dwight sends a
DVD to Rock that reads, "Payback's a bitch.

0 0

Lane on Viernes, 07 Julio 2023 00:30 said:

1 Solution for Selling House: We Buy Houses in Colorado
Sell Your House Quickly: We Purchase Houses in Colorado
Looking to Sell Your House? We Buy Houses in Colorado
Get Cash for Your Colorado House in Any Condition with Our Services
Looking for a Quick Buyer?: We Buy Houses in Colorado
Cash for Your House: We Purchase Houses in Colorado
Get a Quick Sale with Us: We Buy Houses in Colorado
Get a Fair Cash Offer for Your Colorado House:
We Buy Houses
No Commissions. No Stress. We Purchase Houses in Colorado
Get Your House Sold Today with Us: We Buy Houses in Colorado

0 0

Murray on Jueves, 06 Julio 2023 21:56 said:

adorei o método que você usa para escrever seus posts
. Fico bem simples de entender . Abraços

0 0

BrianhoilkWR on Jueves, 06 Julio 2023 21:11 said:

статейный прогон

0 0

F5 GTM/DNS - EDNS RFC COMPLIANCE - DNS FLAG DAY

Contáctenos

Siguenos