Any Yahoo DNS admins on list?

Sat Jan 28 00:34:52 UTC 2017

There is a thread going on the outages mailing list talking about this issue.  Seems to be no failures but increased latency to ns1.yahoo.com and ns3.yahoo.com with trace routes showing USA traffic hitting Asia on v6.

Nolan

> On Jan 27, 2017, at 6:30 PM, Brielle Bruns <bruns at 2mbit.com> wrote:
> 
> 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 at 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 at 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 at 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 at 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