[dns-operations] google.com does not suppor EDNS/OPT

Mats Dufberg mats.dufberg at iis.se
Tue Dec 4 16:51:13 UTC 2018


The google.com replies without OPT when the query has OPT record. It seems to be true for all servers of google.com.

https://www.zonemaster.net/result/396932f178c82fd6



; <<>> DiG 9.10.6 <<>> @216.239.34.10 google.com soa +dns +qr +mu

; (1 server found)

;; global options: +cmd

;; Sending:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15863

;; flags: rd ad; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1



;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags: do; udp: 4096

;; QUESTION SECTION:

;google.com.         IN SOA



;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15863

;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 8

;; WARNING: recursion requested but not available



;; QUESTION SECTION:

;google.com.         IN SOA



;; ANSWER SECTION:

google.com.          60 IN SOA ns1.google.com. dns-admin.google.com. (

                           223945713  ; serial

                           900        ; refresh (15 minutes)

                           900        ; retry (15 minutes)

                           1800       ; expire (30 minutes)

                           60         ; minimum (1 minute)

                           )



;; AUTHORITY SECTION:

google.com.          345600 IN NS ns3.google.com.

google.com.          345600 IN NS ns1.google.com.

google.com.          345600 IN NS ns4.google.com.

google.com.          345600 IN NS ns2.google.com.



;; ADDITIONAL SECTION:

ns3.google.com.             345600 IN A 216.239.36.10

ns3.google.com.             345600 IN AAAA 2001:4860:4802:36::a

ns1.google.com.             345600 IN A 216.239.32.10

ns1.google.com.             345600 IN AAAA 2001:4860:4802:32::a

ns4.google.com.             345600 IN A 216.239.38.10

ns4.google.com.             345600 IN AAAA 2001:4860:4802:38::a

ns2.google.com.             345600 IN A 216.239.34.10

ns2.google.com.             345600 IN AAAA 2001:4860:4802:34::a



;; Query time: 52 msec

;; SERVER: 216.239.34.10#53(216.239.34.10)

;; WHEN: Tue Dec 04 17:47:35 CET 2018

;; MSG SIZE  rcvd: 322





---
Mats Dufberg
DNS Specialist, IIS
Mobile: +46 73 065 3899
https://www.iis.se/en/

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