EDNS Configuration

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EDNS Configuration

Tiago Ratto
Hello there!

I'm using the PDNS recursor version 3.7.2 and came across the EDNS draft. Soon as I got time I've decided to see if the recursor would support that feature, since on the config file there is a configuration called disable-edns which is commented, so I suppose that EDNS is supported. Then a ran dig on my recursor and on google recursor and those are the results I got:

dig @myrecursorserver mail.google.com

; <<>> DiG 9.9.4-RedHat-9.9.4-18.el7_1.1 <<>> @myrecursorserver mail.google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13613
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mail.google.com.               IN      A

;; ANSWER SECTION:
mail.google.com.        3589    IN      CNAME   googlemail.l.google.com.
googlemail.l.google.com. 289    IN      A       173.194.118.53
googlemail.l.google.com. 289    IN      A       173.194.118.54

;; Query time: 0 msec
;; SERVER: myrecursorserver#53(myrecursorserver)
;; WHEN: Wed Jun 03 09:17:54 BRT 2015
;; MSG SIZE  rcvd: 92

==========================================================================


; <<>> DiG 9.9.4-RedHat-9.9.4-18.el7_1.1 <<>> @8.8.8.8 mail.google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28324
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;mail.google.com.               IN      A

;; ANSWER SECTION:
mail.google.com.        21599   IN      CNAME   googlemail.l.google.com.
googlemail.l.google.com. 299    IN      A       216.58.222.5

;; Query time: 53 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed Jun 03 09:18:10 BRT 2015
;; MSG SIZE  rcvd: 87

As you can see, the google server has an OPT PSEUDOSECTION which my recursor doesn't have.

Do I need to configure anything else or maybe I'm missing something ? Or I had the wrong assumption when thinking that the PDNS recursor supports EDNS ?


Tiago Ratto
Friis Telecom
+55 (19) 3565-4500

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Re: EDNS Configuration

Peter van Dijk
Hello Tiago,

On 5 Jun 2015, at 13:49, Tiago Ratto wrote:

> called disable-edns which is commented, so I suppose that EDNS is
> supported. Then a ran dig on my recursor and on google recursor and
> those
> are the results I got:

In currently released versions, EDNS is somewhat supported - but
edns-client-subnet is not.

> Do I need to configure anything else or maybe I'm missing something ?
> Or I
> had the wrong assumption when thinking that the PDNS recursor supports
> EDNS
> ?

I believe dens-client-subnet support for the Recursor is on our 4.x
roadmap :)

Kind regards,
--
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

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