[outages] Github dns record on Sonic

[Graham Freeman]

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-of-6-july-2015/ <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 at nerdventures.com
Twitter: @get_nerdy

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