[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[public-dns-discuss] Re: snu.ac.kr is not being reolved by Google Public DNS only



The A, MX record types are resolving fine. One potential problem could be the size of the TXT response (1424 bytes). Depending on the network path and the protocols in use, the response may be getting fragmented and could be dropped by a firewall or intermediate network device. See http://dnsviz.net/d/snu.ac.kr/dnssec/.

You could use SPF include to make the record smaller or remove any unneeded entries.


; <<>> DiG 9.11.5-P4-5.1-Debian <<>> @8.8.8.8 +dnssec TXT snu.ac.kr
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5164
;; flags: qr rd ra; QUERY: 1, ANSWER: 16, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; QUESTION SECTION:
;snu.ac.kr.                     IN      TXT

;; ANSWER SECTION:
snu.ac.kr.              3599    IN      TXT     "google-site-verification=N1RIql1C8L1uOberlzh4YOdgsIAZwjsB1iTso84C22M"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=hScjHXW3wY-A2JgrqYGynN1WlJs7588YRHduPGTzwTw"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=j8n50f12Y98VRZHcjTrp8JA2TyugISISnIYYH58VHa8"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=e6IL0KYn1010KNg5gMe22w-F00Jbio0fRqra8uy39lI"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=oNykv-XTYSknN58GWBDE85NFKx-d9RCNsoCtmEacsgw"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=mYQB2ZxBNuXazauZt_nPZ_7tsiDak3difUbGlFj2FAE"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=K7okvvIvVzdN-6L-wjH45FYwPAGJqcb4g9Cq5m6caP4"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=Hf_Xyb4urNQ_Ar8o6UvW-f7P9Aqb2FE1StQDgCwATa4"
snu.ac.kr.              3599    IN      TXT     "v=spf1 ip4:147.46.10.211 ip4:147.46.10.212 ip4:147.46.10.52 ip4:147.46.10.202 ip4:147.46.10.203 include:_spf.snu.ac.kr include
:spf.protection.outlook.com ~all"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=chj-XplkvAUDx9ywPv5ogyLrG9XHfGGoE02D-bxbULA"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=vDpuEYOYO6bc7o0D_n9q7hmCjeqvh7EvsPcenx0styE"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=CYtkiJzQdpA5WaHWaBoXpiYhC40NCsErIXYfH0jfRlI"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=3C9g514zUg8bKZUQdrwHpN2bzdMcTbAo-TokW6z2aRk"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=W2yZ7qqp3mih7fqowb7H7yitZHjKigNd1M5qzIGS1C0"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=ESKyuBv2w0F27JRUFSZuOPPSqkJyNWgWv6l9Dlnf92M"
snu.ac.kr.              3599    IN      TXT     "google-site-verification=Ydi86TOAK93FPf4etWQ1lNkCmc4GrEa2q1C-viojRqY"

;; Query time: 234 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Jul 19 10:59:41 EDT 2019
;; MSG SIZE  rcvd: 1424


On Friday, July 19, 2019 at 10:48:46 AM UTC-4, Waqar Ahmad wrote:
Dear DNS experts.

We are having issues which is affecting G Suite Mail flows.

- Mails sent from the systems other than Google are received well by users
- Mails sent by G Suite, Consumer Gmail are not received by mailbox users on snu.ac.kr domain

I did NS lookup. Public servers all over the world are resolving without any issue. 

Google Public DNS is not resolving

Could anyone suggest what could be the cause? This issue has started since yesterday.

--
You received this message because you are subscribed to the Google Groups "public-dns-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to public-dns-discuss+unsubscribe AT googlegroups.com.
To post to this group, send email to public-dns-discuss AT googlegroups.com.
Visit this group at https://groups.google.com/group/public-dns-discuss.
To view this discussion on the web visit https://groups.google.com/d/msgid/public-dns-discuss/0a87970a-aa3e-4d4a-9a8c-d6de96b2dd36%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.