DNS weirdness with cname lookups

Good morning,
Set up: I have MacMini Server running 10.6 and three Mac clients (two with Snow Leopard and one with Lion). All software updates are applied. Two of the clients are connected with ethernet cable and one is connected over the Airport. I use the server to provide DHCP for clients but one client uses a manual ip address. I'm also running DNS with one primary zone for the server (basically).   Forwarder ip addresses are set to 8.8.8.8/8.8.4.4 and recursive queries are accepted from "localnets". This set up has been in place working for many months.
Problem: Yesterday morning, my wife, using her computer (one of the 10.6 clients), complained that her mail was not coming in. We use Apple Mail to connect to Gmail using imap. Mine continued to work fine even though the set up is basically the same but I use the Lion client. There were not any problems browsing and she could get the mail through the Gmail web site, just not imap.
Actions: Through troubleshooting I determined the problem to be associated with DNS lookups of cname records. Lookup of gmail-imap.l.google.com works fine, lookup of imap.gmail.com fails.
Tims-Mac-mini:Programming tim$ dig imap.gmail.com
; <<>> DiG 9.7.3-P3 <<>> imap.gmail.com
;; global options: +cmd
;; connection timed out; no servers could be reached
=====================
Tims-Mac-mini:Programming tim$ dig gmail-imap.l.google.com
; <<>> DiG 9.7.3-P3 <<>> gmail-imap.l.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6239
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 0
;; QUESTION SECTION:
;gmail-imap.l.google.com.          IN          A
;; ANSWER SECTION:
gmail-imap.l.google.com. 231          IN          A          173.194.77.108
gmail-imap.l.google.com. 231          IN          A          173.194.77.109
;; AUTHORITY SECTION:
google.com.                    98135          IN          NS          ns1.google.com.
google.com.                    98135          IN          NS          ns4.google.com.
google.com.                    98135          IN          NS          ns3.google.com.
google.com.                    98135          IN          NS          ns2.google.com.
;; Query time: 422 msec
;; SERVER: <local_DNS_server_ip>#53(<local_DNS_server_ip>)
;; WHEN: Sat Apr 28 07:14:17 2012
;; MSG SIZE rcvd: 145
Initally, this behavior was only on the 10.6 clients but is now also present on the Lion client.
I have used dscacheutil to flush the cache on clients and the server multiple times but it doesn't seem to help.
Yesterday afternoon, I threw up my hands and rebooted the server. It worked (I thought) so I decided it was a mystery I would not understand.
But, the problem returned last night. A lookup of imap.gmail.com works from the server but not from any of the clients.
Does anyone know what is going on? What can I test next?
Thank you in advance.
Tim

It can be the DNS servers your pointing to, normally, I like to go against the SOA for the server to get the correct records.. Take a look here at the DNS for Imap.gmail.com , as you can see it goes after ns1.google.com as the authority server. It returns two A records, gmail-imap.l.google.com , keep in mind if there are no MX records present then the "A" records are used.
Of course you can do all these commands with DIG and get the SOA record and then go against that name server, but your right it is a little wierd that something is messed up. It might be a routing issue outside of your control.
When I go against 8.8.8.8 I get the same response that I get at the site linked in above.
; <<>> DiG 9.3.2 <<>> @8.8.8.8 imap.gmail.com A
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4861
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;imap.gmail.com.               IN     A
;; ANSWER SECTION:
imap.gmail.com.          300     IN     CNAME     gmail-imap.l.google.com.
gmail-imap.l.google.com. 300     IN     A     173.194.70.109
gmail-imap.l.google.com. 300     IN     A     173.194.70.108
;; Query time: 18 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Apr 29 23:55:16 2012
;; MSG SIZE rcvd: 98

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From: Jack Runnels[SMTP:[email protected]]
Reply To: Jack Runnels
Sent: Tuesday, April 21, 1998 10:52 AM
To: Forte' Users Group (E-mail)
Subject: Weirdness with MoveToString()
I am doing a large amount of parsing of HTTP source code to generate
attributes for a multitude of objects. To capture values for these
attributes, I create a TextData object, set its value to be the source
code, then use the MoveToString() method to get to an indicator of
that
attribute. In most incidences of my code, I use an explicitly typed
in
string. In 10 incidences, however, I use a string constant. The
MoveToString() method works fine with all of these. In a new call I
am
doing, I use a string constant, and the method does not work. It
returns
FALSE, even though the string I am searching for is in the source
code. If
I explicitly type the search string, or use a TextData object with its
value set to the string constant, it works.
Does anyone know why the MoveToString() method would not work with a
string
constant for one specific call, when it works with all other similar
calls
I've made? If I use a TextData object with its value set to the
string
constant in the future, can I be assured that a similar problem won't
occur?
Jack Runnels
Consultant
Albion International, Inc.
Voice: 770.980.6753 or
800.492.1048
FAX: 770.980.6734
Internet: [email protected]

Jack, I had similar problem in my project.
Forte uses C - style zero delimited string and my guess is that
in the case of constant it is searching for complete string, delimiter
included. Although it is no brainer to write a simple test I never
got to do it. Hope that helps, Boris.
Jack Runnels wrote:
>
I am doing a large amount of parsing of HTTP source code to generate
attributes for a multitude of objects. To capture values for these
attributes, I create a TextData object, set its value to be the source
code, then use the MoveToString() method to get to an indicator of that
attribute. In most incidences of my code, I use an explicitly typed in
string. In 10 incidences, however, I use a string constant. The
MoveToString() method works fine with all of these. In a new call I am
doing, I use a string constant, and the method does not work. It returns
FALSE, even though the string I am searching for is in the source code. If
I explicitly type the search string, or use a TextData object with its
value set to the string constant, it works.
Does anyone know why the MoveToString() method would not work with a string
constant for one specific call, when it works with all other similar calls
I've made? If I use a TextData object with its value set to the string
constant in the future, can I be assured that a similar problem won't
occur?
Jack Runnels
Consultant
Albion International, Inc.
Voice: 770.980.6753 or
800.492.1048
FAX: 770.980.6734
Internet: [email protected]

External DNS name with Transversal Firewall

Have have one server RedHat 4.0 with SGD 4.1 with this names in diferrent
IP:
server1.company.com (peer dns name)-> IP1
server2.company.com (Bind in another IP2 with external dns name and
firewall forewarding in port 443, the customca is server2.company.com)
Question:
Can I configure SGD 4.1 to respond with two external dns name with
firewall forewarding ?
https://server1.company.com/tarantella
https://server1.company.com/sgd
https://server2.company.com/tarantella
https://server2.company.com/sgd
The client user can works with two names ?
Client prefer to choose access with server1 or server2.
Best Regard�s
Marcelo Moreira Martins
[email protected]
Technical Consultant - Tarantella Systems Engineer
SE- Systems Engineer - M3 System Integrator.
Sun Microsystems do Brasil - Authorized Campus Dealer
+55-51-3333-2644 - Office
+55-51-9962-6536 - Mobile Phone
Visit the EduSoft web site: http://www.sun.com/edu/edusoft/

Marcelo,
It is possible to have more that one external DNS name. Please see:
Array Manager - Array - <server> - General - Properties
In here you can map ip-addresses (of clients) to dns names.
However, a user will not be able to dynamically choose which server to
access - the
server will be selected on the first matching IP pattern.
Regards
"Marcelo M. Martins" <[email protected]> wrote in message
news:dhu1c0$u5m$[email protected]..
Have have one server RedHat 4.0 with SGD 4.1 with this names in diferrent
IP:
server1.company.com (peer dns name)-> IP1
server2.company.com (Bind in another IP2 with external dns name and
firewall forewarding in port 443, the customca is server2.company.com)
Question:
Can I configure SGD 4.1 to respond with two external dns name with
firewall forewarding ?
https://server1.company.com/tarantella
https://server1.company.com/sgd
https://server2.company.com/tarantella
https://server2.company.com/sgd
The client user can works with two names ?
Client prefer to choose access with server1 or server2.
Best Regard�s
Marcelo Moreira Martins
[email protected]
Technical Consultant - Tarantella Systems Engineer
SE- Systems Engineer - M3 System Integrator.
Sun Microsystems do Brasil - Authorized Campus Dealer
+55-51-3333-2644 - Office
+55-51-9962-6536 - Mobile Phone
Visit the EduSoft web site: http://www.sun.com/edu/edusoft/

DNS weirdness with cname lookups

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