Getting different name resolution for news.google.com from master and slave BIND
Lightner, Jeff
JLightner at water.com
Tue May 24 20:33:13 UTC 2011
They aren't in different subnets from an internet perspective and are
not geographically separated. (Yes I know not best practice but I
don't make those decisions.)
The master is dswadns1.water.com at 12.44.84.213 and the slave is
dswadns2.water.com at 12.44.84.214.
The fact they are not in different locations or in a separate subnet is
why I don't understand why I'd be getting separate "location specific"
IPs handed to the two servers.
-----Original Message-----
From: Warren Kumari [mailto:warren at kumari.net]
Sent: Tuesday, May 24, 2011 4:06 PM
To: Lightner, Jeff
Cc: bind-users at lists.isc.org
Subject: Re: Getting different name resolution for news.google.com from
master and slave BIND
On May 24, 2011, at 2:28 PM, Lightner, Jeff wrote:
> Is anyone else seeing odd results with news.google.com? My BIND 9
master and slave are getting different results.
Presumably your slave and master are in different subnets?
Google (and many other large networks) perform geolocation and hand out
A records that a "close" to your resolver. Presumably we believe that
72.14.209.99 is (network wise) close to your master and 74.125.65.99 is
close to your slave.
If you provide IPs and actual locations for your slaves and master I can
check....
W
> If I go out to other sites such as Kloth.net or iptools.com they also
get different results from each other and different from what my master
and slave are reporting.
>
> I'm running BIND 9.3 (The RedHat version that has backported patches
and enhancements from later BIND versions in it so please don't tell me
to use a newer version.)
>
> On doing some research I found that Google has made a couple of
changes in the past week or so affecting their news stuff. The one
that seems like it might explain why Kloth.net, iptools.com and my
server get different answers is the May 13th introduction of "news near
you" discussed in this article:
> http://www.pcmag.com/article2/0,2817,2385369,00.asp
>
> That is aimed at mobile devices but I could see how they might also
try to make it work with static sites. However it wouldn't explain why
both my servers coming from the same location would get different
results. I'm thinking maybe there is something else obvious I'm
missing.
>
> I am not caching on these servers and have bounced named on both but
it didn't help.
>
> Does anyone have any ideas? Other than the fact that they're master
and slave with different IPs and setup to talk to each other the
named.conf on both hosts is the same. They both have the same OS and
same hardware. Also we have some Windows DNS servers in house and they
seem to be giving the same results as my slave so the master appears to
be the odd man out.
>
> When I run "dig news.google.com" from my BIND 9 master I'm getting:
> ; <<>> DiG 9.3.4-P1 <<>> news.google.com
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46508
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 2
>
> ;; QUESTION SECTION:
> ;news.google.com. IN A
>
> ;; ANSWER SECTION:
> news.google.com. 603615 IN CNAME news.l.google.com.
> news.l.google.com. 300 IN A 72.14.209.99
> news.l.google.com. 300 IN A 72.14.209.104
>
> ;; AUTHORITY SECTION:
> google.com. 170523 IN NS ns1.google.com.
> google.com. 170523 IN NS ns2.google.com.
> google.com. 170523 IN NS ns3.google.com.
> google.com. 170523 IN NS ns4.google.com.
>
> ;; ADDITIONAL SECTION:
> ns3.google.com. 344424 IN A 216.239.36.10
> ns4.google.com. 343339 IN A 216.239.38.10
>
> ;; Query time: 6 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Tue May 24 14:17:14 2011
> ;; MSG SIZE rcvd: 190
>
> Yet on my slave I get:
> ; <<>> DiG 9.3.4-P1 <<>> news.google.com
> ;; global options: printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30872
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 4, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;news.google.com. IN A
>
> ;; ANSWER SECTION:
> news.google.com. 603986 IN CNAME news.l.google.com.
> news.l.google.com. 300 IN A 74.125.65.99
> news.l.google.com. 300 IN A 74.125.65.103
> news.l.google.com. 300 IN A 74.125.65.104
> news.l.google.com. 300 IN A 74.125.65.105
> news.l.google.com. 300 IN A 74.125.65.106
> news.l.google.com. 300 IN A 74.125.65.147
>
> ;; AUTHORITY SECTION:
> google.com. 171986 IN NS ns4.google.com.
> google.com. 171986 IN NS ns1.google.com.
> google.com. 171986 IN NS ns2.google.com.
> google.com. 171986 IN NS ns3.google.com.
>
> ;; Query time: 5 msec
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> ;; WHEN: Tue May 24 14:18:03 2011
> ;; MSG SIZE rcvd: 222
>
>
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