[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/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.dns-oarc.net/pipermail/dns-operations/attachments/20181204/1f883c0e/attachment.html>
More information about the dns-operations
mailing list