Github uses Dynect. Dynect just had a short outage. DNS recursors are caching SERVFAILs Dyn seems back now. I was able to clear my caches, and we're back in business. Cheers, jof On Mon, Jul 6, 2015 at 3:32 PM, Grant Ridder via Outages <outages@outages.org> wrote:

Anyone just see github.com DNS records stop getting answered through Sonic DNS servers? (South SF Bay area)

; <<>> DiG 9.8.3-P1 <<>> www.github.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 18789 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION: ;www.github.com. IN A

;; Query time: 20 msec ;; SERVER: 208.201.224.11#53(208.201.224.11) ;; WHEN: Mon Jul 6 15:27:23 2015 ;; MSG SIZE rcvd: 32

-Grant

_______________________________________________ Outages mailing list Outages@outages.org https://puck.nether.net/mailman/listinfo/outages

Yep, me too, but only from the first DNS cluster (208.201.224.11), not from the second (208.201.224.33). In my brief testing, resolving against Google Public DNS, OpenDNS, and Github's authoritative NSes all worked. I'm seeing mentions on Twitter of a recent problem with Dyn, Github.com's authoritative DNS provider. Good relevant post: https://blog.cloudflare.com/the-internet-is-a-cooperative-system-dns-outage-... <https://blog.cloudflare.com/the-internet-is-a-cooperative-system-dns-outage-of-6-july-2015/> Anecdotal test data follows: laptop:~ user$ dig github.com @208.201.224.11 ; <<>> DiG 9.8.3-P1 <<>> github.com @208.201.224.11 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 45452 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;github.com. IN A ;; Query time: 20 msec ;; SERVER: 208.201.224.11#53(208.201.224.11) ;; WHEN: Mon Jul 6 15:37:13 2015 ;; MSG SIZE rcvd: 28 laptop:~ user$ dig github.com @208.201.224.33 ; <<>> DiG 9.8.3-P1 <<>> github.com @208.201.224.33 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7301 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1 ;; QUESTION SECTION: ;github.com. IN A ;; ANSWER SECTION: github.com. 10 IN A 192.30.252.129 ;; AUTHORITY SECTION: github.com. 140188 IN NS ns1.p16.dynect.net. github.com. 140188 IN NS ns2.p16.dynect.net. github.com. 140188 IN NS ns3.p16.dynect.net. github.com. 140188 IN NS ns4.p16.dynect.net. ;; ADDITIONAL SECTION: ns2.p16.dynect.net. 170398 IN A 204.13.250.16 ;; Query time: 29 msec ;; SERVER: 208.201.224.33#53(208.201.224.33) ;; WHEN: Mon Jul 6 15:37:19 2015 ;; MSG SIZE rcvd: 146 laptop:~ user$ whois github.com | grep -i name\ server Name Server: NS1.P16.DYNECT.NET Name Server: NS2.P16.DYNECT.NET Name Server: NS3.P16.DYNECT.NET Name Server: NS4.P16.DYNECT.NET Name Server: ns1.p16.dynect.net Name Server: ns3.p16.dynect.net Name Server: ns4.p16.dynect.net Name Server: ns2.p16.dynect.net laptop:~ user$ for NS in {1..4}; do host github.com ns$NS.p16.dynect.net; done Using domain server: Name: ns1.p16.dynect.net Address: 208.78.70.16#53 Aliases: github.com has address 192.30.252.131 github.com mail is handled by 5 ALT1.ASPMX.L.GOOGLE.com. github.com mail is handled by 1 ASPMX.L.GOOGLE.com. github.com mail is handled by 10 ALT4.ASPMX.L.GOOGLE.com. github.com mail is handled by 10 ALT3.ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT2.ASPMX.L.GOOGLE.com. Using domain server: Name: ns2.p16.dynect.net Address: 204.13.250.16#53 Aliases: github.com has address 192.30.252.130 github.com mail is handled by 10 ALT4.ASPMX.L.GOOGLE.com. github.com mail is handled by 1 ASPMX.L.GOOGLE.com. github.com mail is handled by 10 ALT3.ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT2.ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT1.ASPMX.L.GOOGLE.com. Using domain server: Name: ns3.p16.dynect.net Address: 208.78.71.16#53 Aliases: github.com has address 192.30.252.128 github.com mail is handled by 10 ALT4.ASPMX.L.GOOGLE.com. github.com mail is handled by 10 ALT3.ASPMX.L.GOOGLE.com. github.com mail is handled by 1 ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT2.ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT1.ASPMX.L.GOOGLE.com. Using domain server: Name: ns4.p16.dynect.net Address: 204.13.251.16#53 Aliases: github.com has address 192.30.252.128 github.com mail is handled by 10 ALT3.ASPMX.L.GOOGLE.com. github.com mail is handled by 10 ALT4.ASPMX.L.GOOGLE.com. github.com mail is handled by 1 ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT2.ASPMX.L.GOOGLE.com. github.com mail is handled by 5 ALT1.ASPMX.L.GOOGLE.com. laptop:~ user$ Graham Freeman, Principal Nerd NerdVentures.com graham@nerdventures.com Twitter: @get_nerdy

On 06 Jul 02015, at 15:32, Grant Ridder via Outages <outages@outages.org> wrote:

Anyone just see github.com <http://github.com/> DNS records stop getting answered through Sonic DNS servers? (South SF Bay area)

; <<>> DiG 9.8.3-P1 <<>> www.github.com <http://www.github.com/> ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 18789 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION: ;www.github.com <http://www.github.com/>. IN A

;; Query time: 20 msec ;; SERVER: 208.201.224.11#53(208.201.224.11) ;; WHEN: Mon Jul 6 15:27:23 2015 ;; MSG SIZE rcvd: 32

-Grant _______________________________________________ Outages mailing list Outages@outages.org https://puck.nether.net/mailman/listinfo/outages