Any Yahoo DNS admins on list?

27 Jan 2017

      Hello!

Don't suppose there's a Yahoo admin in the DNS department that can 
investigate/debug a Geolocation issue?

It appears that Yahoo's Geolocation is putting CenturyLink's IPv6 
addresses as being in .BR, causing not only the two CL/Qwest recursive 
servers (205.171.2.65/205.171.3.65/2001:428::1/2001:428::2), but 
recusive servers hosted on biz customer IPv6 6RD ranges to return non-US 
Yahoo servers (and be agonizingly slow).

=====
View from local powerdns recursor, dual stacked, but preferring ipv6 for 
resolving:

root@noc:~# dig mg.mail.yahoo.com @127.0.0.2

; <<>> DiG 9.9.5-9+deb8u9-Debian <<>> mg.mail.yahoo.com @127.0.0.2
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50638
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;mg.mail.yahoo.com.		IN	A

;; ANSWER SECTION:
mg.mail.yahoo.com.	1349	IN	CNAME	fd-geoycpi-uno.gycpi.b.yahoodns.net.
fd-geoycpi-uno.gycpi.b.yahoodns.net. 300 IN A	200.152.162.161
fd-geoycpi-uno.gycpi.b.yahoodns.net. 300 IN A	200.152.162.135

;; Query time: 240 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Fri Jan 27 17:20:52 MST 2017
;; MSG SIZE  rcvd: 116

=====
View from CL/Qwest IPv4 (likely dual stacked) and IPv6 recursors:

root@noc:~# dig mg.mail.yahoo.com @205.171.2.65

; <<>> DiG 9.9.5-9+deb8u9-Debian <<>> mg.mail.yahoo.com @205.171.2.65
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8308
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mg.mail.yahoo.com.		IN	A

;; ANSWER SECTION:
mg.mail.yahoo.com.	758	IN	CNAME	fd-geoycpi-uno.gycpi.b.yahoodns.net.
fd-geoycpi-uno.gycpi.b.yahoodns.net. 138 IN A	200.152.162.161
fd-geoycpi-uno.gycpi.b.yahoodns.net. 138 IN A	200.152.162.135

;; Query time: 17 msec
;; SERVER: 205.171.2.65#53(205.171.2.65)
;; WHEN: Fri Jan 27 17:21:35 MST 2017
;; MSG SIZE  rcvd: 127

root@noc:~# dig mg.mail.yahoo.com @2001:428::1

; <<>> DiG 9.9.5-9+deb8u9-Debian <<>> mg.mail.yahoo.com @2001:428::1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24138
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mg.mail.yahoo.com.		IN	A

;; ANSWER SECTION:
mg.mail.yahoo.com.	464	IN	CNAME	fd-geoycpi-uno.gycpi.b.yahoodns.net.
fd-geoycpi-uno.gycpi.b.yahoodns.net. 214 IN A	200.152.162.161
fd-geoycpi-uno.gycpi.b.yahoodns.net. 214 IN A	200.152.162.135

;; Query time: 46 msec
;; SERVER: 2001:428::1#53(2001:428::1)
;; WHEN: Fri Jan 27 17:23:38 MST 2017
;; MSG SIZE  rcvd: 127

=====
Google recursor for reference:

root@noc:~# dig mg.mail.yahoo.com @8.8.8.8

; <<>> DiG 9.9.5-9+deb8u9-Debian <<>> mg.mail.yahoo.com @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13327
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;mg.mail.yahoo.com.		IN	A

;; ANSWER SECTION:
mg.mail.yahoo.com.	1459	IN	CNAME	fd-geoycpi-uno.gycpi.b.yahoodns.net.
fd-geoycpi-uno.gycpi.b.yahoodns.net. 184 IN A	216.115.100.124
fd-geoycpi-uno.gycpi.b.yahoodns.net. 184 IN A	208.71.44.31
fd-geoycpi-uno.gycpi.b.yahoodns.net. 184 IN A	216.115.100.123
fd-geoycpi-uno.gycpi.b.yahoodns.net. 184 IN A	208.71.44.30

;; Query time: 27 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Jan 27 17:21:59 MST 2017
;; MSG SIZE  rcvd: 159

For reference, CL/Qwest's IPv6 range for 6RD is 2602::/24.

This appears to be impacting Yahoo, Yahoo Mail, Flickr, etc (aka Yahoo 
owned properties).

Thanks!

-- 
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org    /     http://www.ahbl.org

Brielle Bruns

Nolan Berry

Brielle Bruns

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